That which a man continually thinks about determines his actions in times of opportunity and stress. I will know what you are if you tell me what you think about when you don't have to think.

What a man thinks of himself, that it is which determines, or rather indicates, his fate.

A man is literally what he thinks, his character being the complete sum of all his thoughts.

The key to every man is his thought. Sturdy and defying though he look, he has a helm which he obeys, which is the idea after which all his facts are classified. He can only be reformed by showing him a new idea which commands his own.

By far the most vital lesson I have ever learned is the importance of what we think. If I knew what you think, I would know what you are. Our thoughts make us what we are.

How you think matters more than what you think.

Every man is what he is, because of the dominating thoughts which he permits to occupy his mind.

It’s what a man thinks is true which controls his actions, not what is really true.

men’s actions are the best guides to their thoughts

It isn't what people think that's important, but the reason they think what they think.

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

No man knows fully what has shaped his own thinking

The most important thing a man has to tell you is what he’s not telling you,” he said. “The most important thing he has to say is what he’s trying not to say.

The most significant change in a man is not the change in his bodily strength or mental capacity. The most marvelous and far-reaching change which man ever undergoes is in his moral character and spiritual nature.