I wouldn't say 'most' people are prone to negativity. I think it's probably that most people allow negativity to color their thinking, depending on circumstances, but I also believe most people make the necessary efforts to return to positive thinking as quickly as possible.

When you make a mistake, be excited! Analyze what happened, and learn from it.

Never make a promise without a plan.

The first step to getting what you want is to have the courage to get rid of what you don't.

Opportunity is in the person, not the job.

Life is an echo. What you send out comes back.

Check the records; there has never been an undisciplined person who was a champion. Regardless of the field of endeavor, you'll find this to be true.