As I approve of a youth that has something of the old man in him, so I am no less pleased with an old man that has something of the youth. He that follows this rule may be old in body, but can never be so in mind.

Nothing stands out so conspicuously, or remains so firmly fixed in the memory, as something which you have blundered.

Sweet is the memory of past troubles.

We must conceive of this whole universe as one commonwealth of which both gods and men are members.

Here is how you meet women: You tell the girls you are friends with - the ones in relationships - that you want a girlfriend. You shouldn't even have to say 'Set me up' or 'Introduce me!' If they're good girls, they'll get the hint.

I started to be much happier in my relationships when I realized that I can only control myself. That way, you don't worry about people and don't waste your time thinking, 'What if he cheats on me?' You can't control that.

The concept of graphene came along in 1947, but nobody paid much attention to it. I was fascinated because it had a linear E versus K while everything else that people were working on at that time had a quadratic dispersion relationship. I wondered why this was and what was so special about it. That was my fascination.

The less friendly your relationship is on camera, the more useful it is to be friends with them off camera.