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My view is that when in doubt, society should err on the side of life.

Philosophy goes no further than probabilities, and in every assertion keeps a doubt in reserve.

All those who offer an opinion on any doubtful point should first clear their minds of every sentiment of dislike, friendship, anger or pity.

There is something insane about a lack of doubt. Doubt - to me, anyway - is what makes you human, and without doubt, even the righteous lose their grip, not only on reality but also on their humanity.

Skepticism is the first step on the road to philosophy.

I am aware that a philosopher's ideas are not subject to the judgment of ordinary persons, because it is his endeavour to seek the truth in all things, to the extent permitted to human reason by God.

To believe with certainty we must begin with doubting.

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

Philosophy is nothing but discretion.

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.