The vortex theory [of the atom] is only a dream. Itself unproven, it can prove nothing, and any speculations founded upon it are mere dreams about dreams.

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.

It's the ego, not your soul which progresses when your passion turns into an obsession.

History has a way of chasing gravity just like water, feeding into other parts of itself to become something else, something larger and grander, until the one pure thing it was no longer exists.

For a country to have a great writer is to have another government.

Life is not just one thing; life is a lot of things, and I think Ive been lucky to do that.

All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.

The way to defeat fear: decide on a course of conduct and follow it. Keep so busy and work so hard that you forget about being afraid.

Blacks are about seven times more likely to live in neighborhoods of concentrated poverty than whites.

Most criticism of advertising is written in ignorance of what actually happens inside these agencies.

Only twice I let people talk me out of good ideas.