Scepticism is the first step towards truth.

 

Scepticism is the first step towards truth.
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Variant: A thing is not proved just because no one has ever questioned it. What has never been gone into impartially has never been properly gone into. Hence skepticism is the first step toward truth. It must be applied generally, because it is the touchstone.
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As quoted in The Anchor Book of French Quotations with English Translations (1963) by Norbert Gutermam

 

Denis Diderot

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There is but one indefectibly certain truth, and that is the truth that pyrrhonistic scepticism itself leaves standing, — the truth that the present phenomenon of consciousness exists.

 

William James

 

When men follow this blind and powerful instinct of nature, they always suppose the very images, presented by the senses, to be the external objects, and never entertain any suspicion, that the one are nothing but representations of the other. ...This argument is drawn from Dr. Berkeley; and indeed most of the writings of that very ingenious author form the best lessons of scepticism which are to be found either among the ancient or modern philosophers, Bayle not excepted. He professes, however, in his title page (and undoubtedly with great truth) to have composed his book against the sceptics as well as against the atheists and free-thinkers. But that all his arguments, though otherwise intended, are, in reality, merely sceptical, appears from this, that they admit of no answer and produce no conviction. Their only effect is to cause that momentary amazement and irresolution and confusion, which is the result of scepticism.

 

George Berkely

 

Discourses on humility are a source of pride in the vain, and of humility in the humble. So those on scepticism cause believers to affirm. Few men speak humbly of humility, chastely of chastity, few doubtingly of scepticism. We are only falsehood, duplicity, contradiction; we both conceal and disguise ourselves from ourselves. 377

 

Blaise Pascal

 

I agree ... that a professorship of Theology should have no place in our institution. But we cannot always do what is absolutely best. Those with whom we act, entertaining different views, have the power and the right of carrying them into practice. Truth advances, and error recedes step by step only; and to do to our fellow men the most good in our power, we must lead where we can, follow where we cannot, and still go with them, watching always the favorable moment for helping them to another step.

 

Thomas Jefferson

 

Always I will take another step. If that is of no avail I will take another, and yet another. In truth, one step at a time is not too difficult.
I will persist until I succeed.

 

Og Mandino