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The most difficult thing is to know what we do know, and what we do not know.
Therefore, desiring to know anything, we shall before all else determine WHAT we accept as given, and WHAT as demanding definition and proof; that is, determine WHAT we know already, and WHAT we wish to know.
In relation to the knowledge of the world and of ourselves, the conditions would be ideal could we venture to accept nothing as given, and count all as demanding definition and proof. In other words, it would be best to assume that we know nothing, and make this our point of departure.
But unfortunately such conditions are impossible to create. Knowledge must start from some foundation, something must be recognized as known; otherwise we shall be obliged always to define one unknown by means of another.
--
Ch. I

 

P. D. Ouspensky

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I am obliged to interpolate some remarks on a very difficult subject: proof and its importance in mathematics. All physicists, and a good many quite respectable mathematicians, are contemptuous about proof. I have heard Professor Eddington, for example, maintain that proof, as pure mathematicians understand it, is really quite uninteresting and unimportant, and that no one who is really certain that he has found something good should waste his time looking for proof.

 

G. H. Hardy

 

Consider in how many ways His knowledge is distinguished from ours according to all the teaching of every revealed religion. First, His knowledge is one, and yet embraces many different kinds of objects. Secondly, it is applied to things not in existence. Thirdly, it comprehends the infinite. Fourthly, it remains unchanged, though it comprises the knowledge of changeable things; whilst it seems that the knowledge of a thing that is to come into existence is different from the knowledge of the thing when it has come into existence; because there is the additional knowledge of its transition from a state of potentiality into that of reality. Fifthly, according to the teaching of our Law, God's knowledge of one of two eventualities does not determine it, however certain that knowledge may be concerning the future occurrence of the one eventuality.

 

Maimonides

 

Never be bullied into silence.
Never allow yourself to be made a victim.
Accept no one's definition of your life; define yourself.

 

Harvey Fierstein

 

Terrorism is the tactic of demanding the impossible, and demanding it at gunpoint.

 

Christopher Hitchens

 

What mystifies me is how he or any one else can determine what is a desirable type of industry such as should qualify for special assistance of this kind. In my own simple way I should have thought that a desirable industry was, almost by definition, one which could establish itself and thrive without special assistance in ordinary market conditions. Anything else suggests a degree of omniscience which I, at least, am not prepared to credit even the most expert with. I trust the commercial judgment only of those who are themselves taking the risks.

 

John James Cowperthwaite