The content tells a practitioner to think of the Buddha’s loving-kindness with unlimit. The Buddha loved all creatures and wished them to pass though the samsara (round of rebirth). The Buddha, his father King Suddodhana, his mother Sirimahamaya, his son Rahula, he helped them all entering Nibbana. The Buddha also loved even though the persons who harmed him such as Devadatta, Cincamanavika. By doing this, the mind will calm down and be serene.