From Apollonius I learned freedom of will and undeviating steadiness of purpose; and to look to nothing else, not even for a moment, except to reason.

The happiness of your life depends upon the quality of your thoughts.

When you arise in the morning, think of what a precious privilege it is to be alive - to breathe, to think, to enjoy, to love.

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

It never ceases to amaze me: we all love ourselves more than other people, but care more about their opinions than our own.

You have power over your mind - not outside events. Realize this, and you will find strength.

The opinion of 10,000 men is of no value if none of them know anything about the subject.

If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.

Whenever you are about to find fault with someone, ask yourself the following question: What fault of mine most nearly resembles the one I am about to criticize?

The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane.

Very little is needed to make a happy life; it is all within yourself, in your way of thinking.

You surely remember your past when you rebuke me in honesty.

I would rather attempt to do something I want to do regardless of how impossible it may seem than do something I don't want to do regardless of how easy it is to achieve

If you want peace, understand war.

Be careful when you fight the monsters, lest you become one.

What goes around comes back around again.

That was the worst part about having cancer, sometimes: The physical evidence of disease separates you from other people.

Not greeting people isn't enough. One also doesn't greet people one doesn't know.

I was taught that the way of progress was neither swift nor easy.

Repeating moves in an ending can be very useful. Apart from the obvious gain of time on the clock one notices that the side with the advantage gains psychological benefit.