It were not best that we should all think alike; it is difference of opinion that makes horse races.

Speech is civilization itself. The word, even the most contradictory word, preserves contact—it is silence which isolates.

Our ability to reach unity in diversity will be the beauty and the test of our civilization.

Diversity of opinion within the framework of loyalty to our free society is not only basic to a university but to the entire nation.

Isn’t it amazing that we are all made in God’s image, and yet there is so much diversity among his people?

An individual has not started living until he can rise above the narrow confines of his individualistic concerns to the broader concerns of all humanity.

The overwhelming importance of the atmosphere means that there are no longer any frontiers to defend against pollution, attack, or propaganda. It means, further, that only by a deep patriotic devotion to one’s country can there be a hope of the kind of protection of the whole planet, which is necessary for the survival of the people of other countries.

I know only that what is moral is what you feel good after and what is immoral is what you feel bad after.

Hold thought steadfastly to the enduring, the good, and the true, and you will bring these into your experience proportionately to their occupancy of your thoughts.

Two percent of the people think; three percent of the people think they think; and ninety-five percent of the people would rather die than think.

Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.

Take time to deliberate; but when the time for action arrives, stop thinking and go in.

Men who reject the responsibility of thought and reason can only exist as parasites on the thinking of others.

When we are tired, we are attacked by ideas we conquered long ago.

A man is as big as the measure of his thinking.