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.

I still live, I still think: I still have to live, for I still have to think.

The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.

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.

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