Metta Meditation

Mettā meditation: the practice of loving-kindness
Mettā signifies friendship and non-violence as well as "a strong wish for the happiness of others", but also less obvious or direct qualities such as showing patience, receptivity, and appreciation. Though it refers to many seemingly disparate ideas, Mettā is in fact a very specific form of love – a caring for another independent of all self-interest – and thus is likened to one's love for one's child or parent. Understandably, this energy is often difficult to describe in words; however, in the practice of Mettā meditation, one recites specific words and phrases in order to evoke this "boundless warm-hearted feeling." The strength of this feeling is not limited to or by family, religion, or social class. Indeed, Mettā is a tool that permits one's generosity and kindness to be applied to all beings and, as a consequence, one finds true happiness in another person's happiness, no matter who the individual is.

Wikipedia