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

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

The young people of today think of nothing but themselves. They have no reverence for parents or old age. They are impatient of all restraint. They talk as if they alone knew everything and what passes for wisdom with us is foolishness with them. As for girls, they are forward, immodest and unwomanly in speech, behaviour and dress.

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

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

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