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If reason (I mean abstract reason, derived from inquiries a priori) be not alike mute with regard to all questions concerning cause and effect, this sentence at least it will venture to pronounce, That a mental world, or universe of ideas, requires a cause as much, as does a material world, or universe of objects; and, if similar in its arrangement, must require a similar cause. For what is there in this subject, which should occasion a different conclusion or inference? In an abstract view, they are entirely alike; and no difficulty attends the one supposition, which is not common to both of them.
--
Philo to Cleanthes, Part IV

 

David Hume

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Kierkegaard is an Existentialist because he accepts, as fully as Sartre or Camus, the absurdity of the world. But he does not begin with the postulate of the non-existence of God, but with the principle that nothing in the world, nothing available to sense or reason, provides any knowledge or reason to believe in God. While traditional Christian theologians, like St. Thomas Aquinas, saw the world as providing evidence of God's existence, and also thought that rational arguments a priori could establish the existence of God, Kierkegaard does not think that this is the case. But Kierkegaard's conclusion about this could just as easily be derived from Sartre's premises. After all, if the world is absurd, and everything we do is absurd anyway, why not do the most absurd thing imaginable? And what could be more absurd than to believe in God? So why not? The atheists don't have any reason to believe in anything else, or really even to disbelieve in that, so we may as well go for it!

 

Soren Aabye Kierkegaard

 

The men of "sound common sense," i.e., of those snails in intellect who wear their eyes at the tips of their feelers, and cannot even see unless they at the same time touch. When these finger-philosophers affirm that Plato, Bruno, etc., must have been "out of their senses," the just and proper retort is "Gentlemen! it is still worse with you! you have lost your reason."
By the bye, Addison in the Spectator has grossly misrepresented the design and tendency of Bruno's Bestia Trionfante; the object of which was to show of all the theologies and theogonies which have been conceived for the mere purpose of solving problems in the material universe, that as they originate in the fancy, so they all end in delusion, and act to the hindrance or prevention of sound knowledge and actual discovery. But the principal and more important truth taught in this allegory, is, that in the concerns of morality, all pretended knowledge of the will of heaven, which is not revealed to man through his conscience; that all commands, which do not consist in the unconditional obedience of the will to the pure reason, without tampering with consequences (which are in God's power and not in ours); in short, that all motives of hope and fear from invisible powers, which are not immediately derived from, and absolutely coincident with, the reverence due to the supreme reason of the universe, are all alike dangerous superstitions. The worship founded on them, whether offered by the Catholic to St. Francis or by the poor African to his Fetish, differ in form only, not in substance. Herein Bruno speaks not only as a philosopher but as an enlightened Christian; the evangelists and apostles everywhere representing their moral precepts, not as doctrines then first revealed, but as truths implanted in the hearts of men, which their vices only could have obscured.

 

Giordano Bruno

 

If mind is common to us, then also the reason, whereby we are reasoning beings, is common.' If this be so, then also the reason which enjoins what is to be done or left undone is common. If this be so, law also is common; if this be so, we are citizens; if this be so, we are partakers in one constitution; if this be so, the Universe is a kind of Commonwealth.

 

Marcus Aurelius

 

There is neither advance nor service without faith. Nobody can rationally explain why he should sacrifice his life and his happiness for the sake of the good. The conviction that I must obey the ethical imperatives is not derived from logical argument but originates from an intuitive certitude, in a certitude of faith.
There is no conspiracy against reason, no random obstinacy, no sluggish inertia of mind or smug self-assurance entrenched behind the walls of believing. Faith does not detach a man from thinking, it does not suspend reason. It is opposed not to knowledge but to backwardness and dullness, to indifferent aloofness to the essence of living. … It is a distortion to regard reason and faith as alternatives. Reason is a necessary coefficient of faith. Faith without explication by reason is mute, reason without faith is deaf. There can be a true symbiosis of reason and faith.

 

Abraham Joshua Heschel

 

But we don't yet know whether the Universe is open or closed. More than that, there are a few astronomers who doubt that the redshift of distant galaxies is due to the doppler effect, who are skeptical of the expanding Universe and the Big Bang. Perhaps our descendants will regard our present ignorance with as much sympathy as we feel to the ancients for not knowing the Earth went around the Sun. If the general picture, however, of a Big Bang followed by an expanding Universe is correct, what happened before that? Was the Universe devoid of all matter and then the matter suddenly somehow created, how did that happen? In many cultures, the customary answer is that a God or Gods created the Universe out of nothing. But if we wish to pursue this question courageously, we must of course ask the next question: where did God come from? If we decide that this is an unanswerable question, why not save a step and conclude that the origin of the Universe is an unanswerable question? Or, if we say that God always existed, why not save a step, and conclude that the Universe always existed? That there's no need for a creation, it was always here. These are not easy questions. Cosmology brings us face to face with the deepest mysteries, questions that were once treated only in religion and myth.

 

Carl Sagan