Believe that life is worth living and your belief will help create the fact. 
Act as if what you do makes a difference. It does.
Belief creates the actual fact.
Common sense and a sense of humor are the same thing, moving at different speeds. A sense of humor is just common sense, dancing.
Whenever you're in conflict with someone, there is one factor that can make the difference between damaging your relationship and deepening it. That factor is attitude.
Begin to be now what you will be hereafter.
The art of being wise is the art of knowing what to overlook.
This life is worth living, we can say, since it is what we make it.
Acceptance of what has happened is the first step to overcoming the consequences of any misfortune.
Human beings can alter their lives by altering their attitudes of mind.
I don't sing because I'm happy; I'm happy because I sing.
The great use of life is to spend it for something that will outlast it.
A great many people think they are thinking when they are merely rearranging their prejudices.
The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.
Most people never run far enough on their first wind to find out they've got a second.
If you believe that feeling bad or worrying long enough will change a past or future event, then you are residing on another planet with a different reality system.