To do much clear thinking a person must arrange for regular periods of solitude when they can concentrate and indulge the imagination without distraction.

The man who doesn't make up his mind to cultivate the habit of thinking misses the greatest pleasure in life.

There is no limit to which a man will not go to avoid thinking.

The trouble with most people is that they quit before they start.

Some people can't stand being alone. I love solitude and silence. But when I come out of it, I'm a regular talking machine. It's all or nothing for me.

Even people who aren't geniuses can outthink the rest of mankind if they develop certain thinking habits.