Loving-kindness meditation, known in Pali as Metta Bhavana, is a practice of cultivating unconditional goodwill toward yourself and others. You begin by silently repeating phrases such as 'May I be happy. May I be healthy. May I be safe. May I live with ease,' directing them first toward yourself, then toward a loved one, then toward a neutral person, then toward a difficult person, and finally toward all beings everywhere. Research shows that regular loving-kindness practice increases positive emotions, reduces self-criticism, decreases bias toward strangers, and increases feelings of social connection.

Reference:

Wikipedia: Metta (Loving-Kindness)

https://en.wikipedia.org/wiki/Metta