The Discourse on Loving-Kindness (Mettā Sutta)

One who is skilled in what is good and who wishes to attain that state of peace should act thus: be capable, upright, and very upright, obedient, gentle, and free from pride.

Contented, easily supported, with few duties, living lightly, with senses calmed, prudent, not bold, and not clinging to families.

Let him not commit any slight wrong that the wise would later reprove. May all beings be happy and secure; may all beings be happy at heart.

Whatever living beings there are—whether frail or strong, without exception, long, large, medium, short, subtle, or gross—

Whether seen or unseen, those dwelling far or near, those already born or those seeking birth—may all beings be happy at heart.

Let no one deceive another, nor despise anyone anywhere; through anger or thoughts of resentment, let none wish suffering for another.

Just as a mother would protect her only child even at the risk of her own life, even so, let one cultivate a boundless heart toward all beings.

Let one cultivate a boundless mind of loving-kindness toward the entire world—above, below, and across—unobstructed, without enmity, without hostility.

Whether standing, walking, sitting, or lying down, as long as one is awake, one should sustain this mindfulness. This is called a divine abiding here.

Not falling into wrong views, virtuous, and endowed with insight, having abandoned attachment to sensual pleasures, one truly never again enters the womb.