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

There are moments when very little truth would be enough to shape opinion. One might be hated at extremely low cost.

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

I don't judge a regime by the damning criticism of the opposition, but by the ingenuous praise of the partisan.

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.

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.

Kill one man and you're a murderer, kill a million and you're a conqueror.