Yoga Sutra 1.33
मैत्रीकरुणामुदितोपेक्षाणां सुखदुःखपुण्यापुण्यविषयाणां भावनातश्चित्तप्रसादनम्॥
Easy meaning
Friendliness toward the happy, compassion for the hurting, joy for the good, and healthy distance from the harmful — this clears the mind.
When to use
When you absorb everyone’s mood and feel drained.