Vortices of pure energy can exist and, if my theories are right, can compose the bodily form of an intelligent species.

If you can not measure it, you can not improve it.

If you study science deep enough and long enough, it will force you to believe in God.

Heavier-than-air flying machines are impossible.

Can you measure it? Can you express it in figures? Can you make a model of it? If not, your theory is apt to be based more upon imagination than upon knowledge.

When you are face to face with a difficulty, you are up against a discovery.

In science there is only physics; all the rest is stamp collecting.

Radio has no future." "X-rays are clearly a hoax". "The aeroplane is scientifically impossible.

When you can measure what you are speaking about, and express it in numbers, you know something about it.

To measure is to know.

Large increases in cost with questionable increases in performance can be tolerated only in race horses and fancy women.

Why worry? If you've done the very best you can, worrying won't make it any better

Ah, my darling. But there is no such thing [as a nice safe history].

Prince Kanta was crazy!

A real friendship is a light thing. A real friend holds you loosely.

I don't even watch my own show: I tape it, I'm out.

Personally, I hold that a man, who deliberately and intelligently takes a pledge and then breaks it, forfeits his manhood.

Not one man in a thousand has either strength of mind or goodness of heart to be an Atheist. I repeat it. Not one man in a thousand has either strength of mind or goodness of heart to be an Atheist.

It's immoral that people make money out of writing crap, but I try not to obsess about it. I don't want to spend my life being angry.

I think I am beginning to learn something about painting.

Cambridge was a joy. Tediously. People reading books in a posh place. It was my fantasy. I loved it. I miss it still.