A scientific man ought to have no wishes, no affections, - a mere heart of stone.

All tyranny needs to gain a foothold is for people of good conscience to remain silent.

The good times of today are the sad thoughts of tomorrow.

A process cannot be understood by stopping it. Understanding must move with the flow of the process, must join it and flow with it.

The more you like yourself, the less you are like anyone else, which makes you unique.

The word 'good' has many meanings. For example, if a man were to shoot his grandmother at a range of five hundred yards, I should call him a good shot, but not necessarily a good man.

It's better to be unhappy alone than unhappy with someone.

I've had a perfectly wonderful evening, but this wasn't it.

They say I do not have the qualifications to be president, that I do not have education. Well, I would never divide the Liberian people.

I want to put a ding in the universe.

Sanity is a madness put to good uses.

Being an intellectual creates a lot of questions and no answers.

I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do.

It is wonderful when you don't have the fear, and a lot of the time I don't ... I focus on what needs to be done instead.

No flying machine will ever fly from New York to Paris.

The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic

It is piracy, not overt online music stores, which is our main competitor.

The advantage of a bad memory is that one enjoys several times the same good thing for the first time.

Reputation is what men and women think of us; character is what God and angels know of us.

He who surpasses or subdues mankind must look down on the hate of those below.

To be rooted is perhaps the most important and least recognized need of the human soul.