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

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.

Of my conception I know only what you know of yours. It occurred in darkness and I was unconsenting... By some bleak alchemy what had been mere unbeing becomes death when life is mingled with it.

A system is only as effective as your level of commitment to it.

Anyone need advice on making the transition from 5.12 to 5.11?

It's terrifying to have a voice right now. It's so terrifying, and it's so essential.

You can't defend the indefensible. Anything you say sounds self-serving and hypocritical.

Most people forget that even in Iraq, by the time the air and no-fly zone was established, the air defence system had been removed through the first Gulf war. All of them had been neutralised.

The histories of the lives and fortunes of men are full of instances of this nature,--where favorable times and lucky accidents have done for them, what wisdom or skill could not.

Nobody drowns by falling in the water...but by staying there.

When your location is a snowy mountain in the winter the obstacles are pretty extreme.

I think my idea of retirement might be to one day work a 40-hour week.