Progress

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes

If we mean to have heroes, statesmen and philosophers, we should have learned women

Some day science may have the existence of mankind in power, and the human race can commit suicide by blowing up the world

We are growing serious, and let me tell you, that's the very next step to being dull

When men are easy in their circumstances, they are naturally enemies to innovations

Silly things do cease to be silly if they are done by sensible people in an impudent way

What is now proved was once only imagined.

The true method of knowledge is experiment.

Improvement makes straight roads; but the crooked roads without improvement are roads of genius

Without contraries is no progression.

There are no shortcuts in evolution

Our government teaches the whole people by its example. If the government becomes the lawbreaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy

The logic of words should yield to the logic of realities

The longest day must have its close -the gloomiest night will wear on to a morning. An eternal, inexorable lapse of moments is ever hurrying the day of the evil to an eternal night, and the night of the just to an eternal day

Growth itself contains the germ of happiness

The young do not know enough to be prudent, and therefore they attempt the impossible - and achieve it, generation after generation

Progress is the law of life, man is not man as yet

If your goal is to reduce costs, then coal is a good idea. If the goal is a renewable fuel, coal is a bad idea. When greenhouse-gas emissions go up, environmentalists take note. Then you've got a problem

We have to be creative and think of ways to make the airport more than just an airport. We need to think of ways to make it an economic-development hub