Yoga Sutras 2.15
Patanjali, explained by Swami Vivekananda
परिणामताप-संस्कारदुःखैर्गुणवृत्तिविरोधाच्च दुःखमेव सर्वं विवेकिनः ॥
pariṇāmatāpa-saṃskāraduḥkhairguṇavṛttivirodhācca duḥkhameva sarvaṃ vivekinaḥ
To the discriminating, all is, as it were, painful on account of everything bringing pain either as consequence, or as anticipation of loss of happiness, or as fresh craving arising from impressions of happiness, and also as counteraction of qualities.
In plain words: A wise person sees that everything in the world brings pain in the end. Pain can come as a result, or as the fear of losing a happiness we have. It can come as new craving left behind by past pleasure, or from the constant clash of our changing moods. Pleasure and pain always follow each other, yet people chase happiness as if it will last.
Swami Vivekananda explains
The Yogis say that the man who has discriminating powers, the man of good sense, sees through all that are called pleasure and pain, and knows that they come to all, and that one follows and melts into the other; he sees that men follow an ignis fatuus all their lives, and never succeed in fulfilling their desires. The great king Yudhishthira once said that the most wonderful thing in life is that every moment we see people dying around us, and
Keep reading
yet we think we shall never die. Surrounded by fools on every side, we think we are the only exceptions, the only learned men. Surrounded by all sorts of experiences of fickleness, we think our love is the only lasting love. How can that be? Even love is selfish, and the Yogi says that in the end we shall find that even the love of husbands and wives, and children and friends, slowly decays. Decadence seizes everything in this life. It is only when everything, even love, fails, that, with a flash, man finds out how vain, how dream-like is this world. Then he catches a glimpse of Vairāgya (renunciation), catches a glimpse of the Beyond. It is only by giving up this world that the other comes; never through holding on to this one. Never yet was there a great soul who had not to reject sense-pleasures and enjoyments to acquire his greatness. The cause of misery is the clash between the different forces of nature, one dragging one way, and another dragging another, rendering permanent happiness impossible.