To enjoy good health, to bring true happiness to one's family, to bring peace to all, one must first discipline and control one's own mind. If a man can control his mind he can find the way to enlightenment, and all wisdom and virtue will naturally come to him.
Forgiveness is something that most people fail miserably at even thought it’s so simple. Grudges only bring more misery to those who hold them and prevent good relations with the target. YOU makes mistakes all of the time so why not have mercy when other do? Remaining angry feels horrible while forgiving someone brings a refreshing sensation to the mind and healing to the relationship.
If you truly want to be a master of life, let love be in your every action. Love your friends, family and enemies alike. This is a difficult thing to do. But if you accomplish this, you will be seen as a leader among everyone that allows hate, envy, disgust and all other negative emotions into their lives. Think Gandhi. Love is so rare in this world when compared to the massive presence of hate that by exuding love, you will immediately see yourself and the people around you change. Love. Love. Love.
The only person that can make you unhappy is you! You are the one that decides to be affected by the words and actions of others. Realize this so that the next time you experience a negative emotion, you can find the strength within yourself to overcome it.