If you would be a real seeker after truth it is necessary that at least once in your life you doubt

If you would be a real seeker after truth it is necessary that at least once in your life you doubt as far as possible all things.

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The reading of all good books is like a conversation with the finest minds of past centuries.

The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.

Travelling is almost like talking with those of other centuries.

Each problem that I solved became a rule which served afterwards to solve other problems.

To see what is in front of one's nose needs a constant struggle.

The further a society drifts from the truth, the more it will hate those who speak it.

Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all of one’s lifetime.

We travel not to escape life, but for life not to escape us.