Maimonides

There is one [disease] which is widespread, and from which men rarely escape. This disease varies in degree in different men ... I refer to this: that every person thinks his mind ... more clever and more learned than it is ... I have found that this disease has attacked many an intelligent person ... They ... express themselves [not only] upon the science with which they are familiar, but upon other sciences about which they know nothing ... If met with applause ... so does the disease itself become aggravated.

When a man reflects on these things, studies all these created beings, from the angels and spheres down to human beings and so on, and realizes the divine wisdom manifested in them all, his love for God will increase, his soul will thirst, his very flesh will yearn to love God. He will be filled with fear and trembling, as he becomes conscious of his lowly condition, poverty, and insignificance, and compares himself with any of the great and holy bodies; still more when he compares himself with any one of the pure forms that are incorporeal and have never had association with any corporeal substance. He will then realize that he is a vessel full of shame, dishonor, and reproach, empty and deficient.

Some consider... all wants of the body as shame, disgrace, and defect to which they are compelled to attend; this is chiefly the case with the sense of touch, which is a disgrace to us according to Aristotle, and which is the cause of our desire for eating, drinking, and sensuality. Intelligent persons must, as much as possible, reduce these wants, guard against them, abstain from speaking of them, discussing them, and attending to them in company of others. Man must have control over all these desires, reduce them as much as possible, and only retain of them as much as is indispensable. His aim must be the aim of man as man, viz., the formation of ideas, and nothing else. The best and sublimest among them is the idea which man forms of God, angels, and the rest of the creation according to his capacity. Such men are always with God, and of them it is said, "Ye are princes, and all of you are children of the Most High." (Ps. lxxxii. 6) This is man's task and purpose.

When [ Abraham] the "Pillar of the World" appeared, he became convinced that there is a spiritual Divine Being, which is not a body, nor a force residing in a body, but is the author of the spheres and the stars; and he saw the absurdity of the tales in which he had been brought up. He therefore began to attack the belief of the Sabeans, to expose the falsehood of their opinions, and to proclaim publicly in opposition to them, "the name of the Lord, the God of the Universe" (Gen. xxi. 33), which proclamation included at the same time the Existence of God, and the Creation of the Universe by God.

In accordance with the Sabean theories images were erected to the stars, golden images to the sun, images of silver to the moon, and they attributed the metals and the climates to the influence of the planets, saying that a certain planet is the god of a certain zone. They built temples, placed in them images, and assumed that the stars sent forth their influence upon these images, which are thereby enabled (to speak) to understand, to comprehend, to inspire human beings, and to tell them what is useful to them. They apply the same to trees which fall to the lot of these stars.

It is better and more satisfactory to acquit a thousand guilty persons than to put a single innocent one to death.

Abraham was the first to teach the Unity of God, to establish the faith, to cause it to remain among coming generations, and to win his fellow-men to his doctrine; as Scripture says of him: "I know him, that he will command," &c. (Gen. xviii. 19)

The proposition has... been laid down in the most general terms, "All evils are negations." Thus for man death is evil; death is his non-existence. Illness, poverty, and ignorance are evils for man; all these are privations of properties. ...The destruction of other things is likewise nothing but the absence of their form. After these propositions, it must be admitted as a fact that it cannot be said of God that He directly creates evil, or He has the direct intention to produce evil; this is impossible. His works are all perfectly good. He only produces existence, and all existence is good; whilst evils are of a negative character, and cannot be acted upon.

He [ Ezekiel] further says, "As the appearance of the bow that is in the cloud in the day of the rain, so was the appearance of the brightness round about. This was the appearance of the likeness of the glory," (i. 28). The substance and the true essence of the bow described here is well known. The simile and comparison is in this case very extraordinary, and is undoubtedly part of the prophecy; and note it well.

Having concluded these introductory remarks I proceed to examine those expressions, to the true meaning of which, as apparent from the context, it is necessary to direct your attention. This book will then be a key admitting to places the gates of which would otherwise be closed. When the gates are opened and men enter, their souls will enjoy repose, their eyes will be gratified, and even their bodies, after all toil and labour, will be refreshed.

Accept the truth from whatever source it comes.

In short, the opinion of Aristotle is this: Everything is the result of management which is constant, which does not come to an end and does not change any of its properties, as e.g., the heavenly beings, and everything which continues according to a certain rule... But that which is not constant, and does not follow a certain rule... is due to chance and not to management; it is in no relation to Divine Providence. Aristotle holds that it is even impossible to ascribe to Providence that management of these things. ...It is the belief of those who turned away from our Law and said: "God hath forsaken the earth." (Ezek. ix. 9)

Those who wash their body and cleanse their garments whilst they remain dirty by bad actions and principles, are described by Solomon as "a generation that are pure in their own eyes, and yet are not washed from their filthiness; a generation, oh how lofty are their eyes!" &c. (Prov. xxx. 12-13). Consider well the principles which we mentioned... as the final causes of the Law; for there are many precepts, for which you will be unable to give a reason unless you possess a knowledge of these principles...

Actions are divided as regards their object into four classes; they are either purposeless, unimportant, or vain, or good.

Know that for the human mind there are certain objects of perception which are within the scope of its nature and capacity; on the other hand, there are, amongst things which actually exist, certain objects which the mind can in no way and by no means grasp: the gates of perception are closed against it. Further, there are things of which the mind understands one part, but remains ignorant of the other; and when man is able to comprehend certain things, it does not follow that he must be able to comprehend everything.

By following entirely the guidance of lust, in the manner of fools, man loses his intellectual energy, injures his body, and perishes before his natural time; sighs and cares multiply; there is an increase of envy, hatred, and warfare, for the purpose of taking what another possesses. The cause of all this is the circumstance that the ignorant considers physical enjoyment as an object to be sought for its own sake. God in His wisdom has therefore given us such commandments as would counteract that object, and prevent us altogether from directing our attention to it, and has debarred us from everything that leads only to excessive desire and to lust. This is an important thing included in the objects of our Law.

Do not imagine that these most difficult problems can be thoroughly understood by any one of us. This is not the case. At times the truth shines so brilliantly that we perceive it as clear as day. Our nature and habit then draw a veil over our perception, and we return to a darkness almost as dense as before. We are like those who, though beholding frequent flashes of lightning, still find themselves in the thickest darkness of the night. On some the lightning flashes in rapid succession, and they seem to be in continuous light, and their night is as clear as the day. This was the degree of prophetic excellence attained by (Moses) the greatest of prophets, to whom God said," But as for thee, stand thou here by Me" (Deut. v. 31), and of whom it is written" the skin of his face shone," etc. (Exod. xxxiv. 29). [Some perceive the prophetic flash at long intervals; this is the degree of most prophets.] By others only once during the whole night is a flash of lightning perceived. This is the case with those of whom we are informed," They prophesied, and did not prophesy again" (Num. xi. 25). There are some to whom the flashes of lightning appear with varying intervals; others are in the condition of men, whose darkness is illumined not by lightning, but by some kind of crystal or similar stone, or other substances that possess the property of shining during the night; and to them even this small amount of light is not continuous, but now it shines and now it vanishes, as if it were" the flame of the rotating sword."

The so-called evils are evils only in relation to a certain thing, and that which is evil in relation to a certain existing thing, either includes the non-existence of that thing or the non-existence of some of its good conditions.

God cannot be compared to anything. Note this.

Scripture says:—If a man should rise, pretend to be a prophet, and show you his signs by which he desired to convince you that his words are true, know that God intends thereby to prove to the nations how firmly you believe in the truth of God's Word, and how well you have comprehended the true Essence of God; that you cannot be misled by any tempter to corrupt your faith in God. Your religion will then afford a guidance to all who seek the truth, and of all religions man will choose that which is so firmly established that it is not shaken by the performance of a miracle. For a miracle cannot prove that which is impossible; it is useful only as a confirmation of that which is possible, as we have explained in our Mishneh-torah.