Love yourself and love everyone,
Forgive yourself and life becomes tranquil.
Empathize with people about how they feel, you will be elated with ability to understand humans. Showing sympathy and compassion does solve your peace of mind. On the other hand, condemning, and criticizing others is often welcoming the thoughts, and feelings of same actions for yourself.
It is easy to appreciate, it is the essence of life. To love and pass on your vibes to people. Never think negative about anyone even if you hate them. Jealousy, and greed will ensure disturbance of your temper itself. Always speak good of others. For saying negative is welcoming same thoughts and the chain of cause and effect is the law of life.