The best thinking has been done in solitude. The worst has been done in turmoil.

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.

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

Although I am a gregarious person, I love solitude even more.

All I have to do is think and not be influenced by other.