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Logic is the technique by which we add conviction to truth.

Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.

Doubt grows with knowledge.

I think when you're doing good work, you don't necessarily need to be validated.

There is a kind of courtesy in skepticism. It would be an offense against polite conventions to press our doubts too far.

Doubt is the incentive to truth and inquiry leads the way.

I think we ought always to entertain our opinions with some measure of doubt. I shouldn't wish people dogmatically to believe any philosophy, not even mine.

To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection.

Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense.

What is important is that one utilizes one's intellect and not to be 100 percent sure about one's convictions. One should always leave room for doubt.