We are what our thoughts have made us; so take care about what you think. Words are secondary. Thoughts live; they travel far.

When an idea exclusively occupies the mind, it is transformed into an actual physical or mental state.

The oldest, shortest words — "yes" and "no" — are those which require the most thought.

To find yourself, think for yourself.

I cannot teach anybody anything, I can only make them think.

It is the mark of an educated mind to be able to entertain a thought without accepting it.

Kindness in words creates confidence. Kindness in thinking creates profoundness. Kindness in giving creates love.

When anger rises, think of the consequences.

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

If you think you can do a thing or think you can't do a thing, you're right.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.

Think for yourselves and let others enjoy the privilege to do so, too.

A man is not idle because he is absorbed in thought. There is a visible labor and there is an invisible labor.

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

A man is but the product of his thoughts; what he thinks, he becomes.

Happiness is when what you think, what you say, and what you do are in harmony.