The only path by which another person can upset you is through your own thought.

The more I see, the less I know for sure.

Thinking is the talking of the soul with itself.

Happiness is just how you feel when you don't feel miserable.

A man is but the product of his thoughts. What he thinks he becomes.

Reality leaves a lot to the imagination.

Change your thoughts, and you change your destiny.

I'm not afraid of death because I don't believe in it.

The highest possible stage in moral culture is when we recognise that we ought to control our thoughts.