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.

Of course motivation is not permanent. But then, neither is bathing; but it is something you should do on a regular basis.

You can disagree without being disagreeable.

You must manage yourself before you can lead someone else.

What you feed your mind determines your appetite.

The problem with pity parties is very few people come, and those who do don't bring presents.

You will make a lousy anybody else, but you will be the best "you" in existence.