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

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

Hard knocks have a place and value, but hard thinking goes farther in less time.

Thinking is the hardest work there is, which is probably the reason so few engage in it.

All thinking begins with wondering.

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.