Being right is less important to us than the freedom to be wrong.

Marriage simplifies life and complicates the day.

Already at the origin of the species man was equal to what he was destined to become.

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

It is sometimes important for science to know how to forget the things she is surest of.

We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.

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.