By cultivating attitudes of friendliness toward the happy, compassion for the unhappy, delight in the virtuous, and disregard for the wicked, the mind retains its undisturbed calmness.
—The Yoga Sutras of Patanjali
A sutra is an aphorism. The word itself means thread. Of this particular sutra, the revered teacher Swami Satchidananda said, “It will be very helpful to you in keeping a peaceful mind in your daily life.”