Focus 90% of your time on solutions and only 10% of your time on problems.
Build your reputation by helping other people build theirs.
Smile, it is the key that fits the lock of everybody's heart.
The people who oppose your ideas are inevitably those who represent the established order that your ideas will upset.
You must first get along with yourself before you can get along with others.
You don't have to hold a position in order to be a leader.