Learn from both your mistakes and successes because if you learn only from your mistakes you will only learn more errors

Believe you can, and you can. Belief is one of the most powerful of all problem dissolvers. When you believe that a difficulty can be overcome, you are more than halfway to victory over it already.

Any fact facing us, however difficult, even seemingly hopeless, is not so important as our attitude toward that fact. How you think about a fact may defeat you before you ever do anything about it. You may permit a fact to overwhelm you mentally before you deal with it actually. On the other hand, a confident and optimistic thought pattern can overcome or modify the fact altogether.

Don't bother. The glass is half-empty.

Watch your manner of speech if you wish to develop a peaceful state of mind.

If you want things to be different, perhaps the answer is to become different yourself.

Stress the thought of plenty. Thoughts of plenty help create plenty.