I must have a prodigious quantity of mind; it takes me as much as a week sometimes to make it up.

Always acknowledge a fault frankly. This will throw those in authority off their guard and give you opportunity to commit more.

They spell it 'Vinci' and pronounce it 'Vinchy'. Foreigners always spell better than they pronounce.

I do not take any credit to my better-balanced head because I never went crazy on Presbyterianism. We go too slow for that. You never see us ranting and shouti…

I'm in a constant process of thinking about things. I'll think about things for thirty or forty years before I'll write it.

Scientific thought, then, is not momentary; it is not a static instance; it is a process.

Now it is no longer a matter of deciding what to do, but of deciding how to decide.