Whether man is disposed to yield to nature or to oppose her, he cannot do without a correct understanding of her language

When I was young I pitied the old. Now old, it is the young I pity.

What scientist would not long to go on living, if only to see how the little truths he has brought to light will grow up?

It takes a very deep-rooted opinion to survive unexpressed.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.

I should have no use for a paradise in which I should be deprived of the right to prefer hell.

Truth is always served by great minds, even if they fight it.