“The lack of power to take joy in outdoor nature is as real a misfortune as the lack of power to take joy in books.”

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

Nothing worth having comes easy.

There can be no life without change, and to be afraid of what is different or unfamiliar is to be afraid of life.

To educate a man in mind and not in morals is to educate a menace to society.

Do what you can, with what you have, where you are.

A vote is like a rifle: its usefulness depends upon the character of the user.

The joy in life is his who has the heart to demand it.

When they call the roll in the Senate, the Senators do not know whether to answer ‘Present’ or ‘Not Guilty’.

The conservation of natural resources is the fundamental problem. Unless we solve that problem it will avail us little to solve all others.

It is hard to fail but it is worse never to have tried to succeed.

This country will not be a good place for any of us to live in unless we make it a good place for all of us to live in.

Every reform movement has a lunatic fringe.

The best executive is the one who has sense enough to pick good men to do what he wants done, and self-restraint to keep from meddling with them while they do it.

It is no use to preach to children if you do not act decently yourself.

To educate a person in the mind but not in morals is to educate a menace to society.

Every immigrant who comes here should be required within five years to learn English or leave the country.

As long as your intentions are solid and about growth and progression and being productive and not being idle, then you’re doing good in my book.

Failure is the first chapter in the book of success. 

Words are power. And a book is full of words. Be careful what power you get from it. But know that you do.

So perhaps the best thing to do is to stop writing Introductions and get on with the book.

The book is true, and if evidence seems to condtradict it, it is the evidence that must be thrown out not the book.

I have sold more books on physics than Madonna has on sex.

I have sold more books on physics than Madonna has on sex.

The best books are those that tell you what you know already.