In Theravada practice across Sri Lanka, Myanmar, Thailand and other Buddhist countries of South and Southeast Asia, the Karaniya Metta Sutta belongs to the paritta literature, texts chanted by monks for the protection and wellbeing of listeners, and it is commonly recited at funerals, house blessings and times of communal difficulty such as illness or natural disaster.
Its use in this protective role sits alongside a second, quite different function as a formal meditation subject in its own right: practitioners of metta bhavana, the systematic cultivation of loving kindness, often use the sutta's phrases as the literal script of their meditation, extending goodwill first to themselves, then to loved ones, then to neutral people, then to difficult people, and finally to all beings without distinction. This dual use, as chanted protective text and as detailed meditation instruction, means the sutta functions simultaneously at the level of communal ritual and of individual mental training, a combination not every paritta text shares equally. Its closing image, comparing the practitioner's conduct while cultivating this state to living out one's life without falling into wrong views, ties the meditative practice back to the ethical conduct the sutta opened with, closing the circle between behavior and mental cultivation.