Unconditional Loving Kindness

From the Metta Sutta
May all beings be happy.
May they be joyous and live in safety.
All living beings, whether weak or strong, in high or middle or low realms of existence, small or great, visible or invisible, near or far, born or to be born, may all beings be happy.
Let no one deceive another, nor despise any being in any state; Let none by anger or hatred wish harm to another.
Even as a mother at the risk of her life watches over and protects her only child, so with a boundless mind should one cherish all living things, suffusing love over the entire world, above, below and all around without limit; so let one cultivate an infinite good will toward the whole world. 

In the Pali cannon of Buddha's teachings we find the Metta Sutta.  Metta is translated as loving kindness.  It is differentiated from compassion in that it describes a benevolence toward all beings that is fee from selfish attachment whereas compassion is an active sympathy where one is willing to accept the suffering for another.  The practice of metta meditation is a powerful tool in overcoming anger.