A man thinking or working is always alone, let him be where he will.

A man who does not think for himself does not think at all.

All deep, earnest thinking is but the intrepid effort of the soul to keep the open independence of her sea, while the wildest winds of heaven and earth conspire to cast her on t ...

As a single footstep will not make a path on the earth, so a single thought will not make a pathway in the mind. To make a deep physical path, we walk again and again. To make a ...

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.

I think that I think, therefore I think that I am.

It is human nature to think wisely and to act in an absurd fashion.

The open mind never acts: when we have done our utmost to arrive at a reasonable conclusion, we still must close our minds for the moment with a snap, and act dogmatically on ou ...

There is nothing either good or bad, but thinking makes it so.

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