Study a single sutra by selecting the pada (chapter) and then the sutra (verse).
Source: English translation from The Yoga Sutras of Patanjali (Sri Swami Satchidananda)
By cultivating attitudes of friendliness toward the happy, compassion for the unhappy, delight in the virtuous, and disregard toward the wicked, the mind-stuff retains its undisturbed calmness.
Source: English translation from Light on the Yoga Sutras of Patanjali (B.K.S. Iyengar)
Through cultivation of friendliness, compassion, joy, and indifference to pleasure and pain, virtue and vice respectively, the consciousness becomes favourably disposed, serene and benevolent.
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
Undisturbed calmness of mind is attained by cultivating friendliness toward the happy, compassion for the unhappy, delight in the virtuous, and indifference toward the wicked.
Source: English translation from The Heart of Yoga (T.K.V. Desikachar)
In daily life we see people around who are happier than we are, people who are less happy. Some may be doing praiseworthy things and others causing problems. Whatever may be our usual attitude toward such people and their actions, if we can be pleased with others who are happier than ourselves, compassionate toward those who are unhappy, joyful with those doing praiseworthy things, and remain undisturbed by the errors of others, our mind will be very tranquil.
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
In relationships, the mind becomes purified by cultivating feelings of friendliness towards those who are happy, compassion for those who are suffering, goodwill towards those who are virtuous, and indifference or neutrality towards those we perceive as wicked or evil.