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Not to be disturbed by either joy or grief, pleasure or displeasure, by what people say or do or by any outward things is called in yoga state of samatā, equality to all things.

<ref>http://incarnateword.in/sabcl/23/human-relationships-in-yoga-iv#p24</ref>

Equality means a quiet and unmoved mind and vital, it means not to be touched or disturbed by things that happen or things said or done to you, but to look at them with a straight look, free from the distortions created by personal feelings, and to try to understand what is behind them, why they happen, what is to be learnt from them, what is it in oneself which they are cast against and what inner profit or progress one can make out of them; it means self-mastery over the vital movements, - anger and sensitiveness and pride as well as desire and the rest, - not to let them get hold of the emotional being and disturb the inner peace, not to speak and act in the rush and impulsion of these things, always to act and speak out of a calm inner poise of the spirit. It is not easy to have this equality in any full perfect measure, but one should always try more and more to make it the basis of one’s inner state and outer movements.

<ref>http://incarnateword.in/sabcl/23/the-foundation-of-sadhana-iv#p3</ref>