Habit is a second nature which prevents us from knowing the first, of which it has neither the cruelties nor the enchantments.

As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress.

A powerful idea communicates some of its strength to him who challenges it.

Happiness is beneficial for the body, but it is grief that develops the powers of the mind.

If a little dreaming is dangerous, the cure for it is not to dream less but to dream more, to dream all the time.

The time at our disposal each day is elastic the passions we feel dilate it, those that inspire us shrink it, and habit fills it.

Love is space and time measured by the heart.

Time, which changes people, does not alter the image we have retained of them.

We must never be afraid to go too far, for truth lies beyond.

We don't receive wisdom we must discover it for ourselves after a journey that no one can take for us or spare us.