Ability to think, like the violin or piano, requires daily practice.

Think before you speak, your words could hurt someone's feeling more than you intended it to.

Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.

A man who cannot think is not an educated man however many college degrees he may have acquired.

If you want your life to be more rewarding, you have to change the way you think.

We do not belong to those who only get their thought from books, or at the prompting of books. It is our custom to think in the open air, walking, leaping, climbing, or dancing on lonesome mountains by preference, or close to the sea, where even the paths become thoughtful.