A man is not old as long as he is seeking something.
When a scientist is ahead of his times, it is often through misunderstanding of current, rather than intuition of future truth. In science there is never any error so gross that it won't one day, from some perspective, appear prophetic.
Beauty in art is often nothing but ugliness subdued.
Already at the origin of the species man was equal to what he was destined to become.
A married couple are well suited when both partners usually feel the need for a quarrel at the same time.
A few great minds are enough to endow humanity with monstrous power, but a few great hearts are not enough to make us worthy of using it.
A body of work such as Pasteur's is inconceivable in our time: no man would be given a chance to create a whole science. Nowadays a path is scarcely opened up when the crowd begins to pour in.
The books one has written in the past have two surprises in store: one couldn't write them again, and wouldn't want to.
The least one can say of power is that a vocation for it is suspicious.
The ideal, without doubt, varies, but its enemies, alas, are always the same.
The divine is perhaps that quality in man which permits him to endure the lack of God.
The nobility of a human being is strictly independent of that of his convictions.
Stupidity, outrage, vanity, cruelty, iniquity, bad faith, falsehood - we fail to see the whole array when it is facing in the same direction as we.
Somebody told me I should put a pebble in my mouth to cure my stuttering. Well, I tried it, and during a scene I swallowed the pebble. That was the end of that.
Renown? I've already got more of it than those I respect, and will never have as much as those for whom I feel contempt.