तं विद्याद् दुःखसंयोगवियोगं योगसंज्ञितम्। स निश्चयेन योक्तव्यो योगोऽनिर्विण्णचेतसा
taṁ vidyād duḥkha-sanyoga-viyogaṁ yogasaṅjñitam sa niśhchayena yoktavyo yogo ’nirviṇṇa-chetasā
This inner severance from the affliction of misery is spirituality. It should be practiced with determination and with a heart that refuses to be depressed.
Translated by Shri Purohit Swami
Let this be known by the name of Yoga, the severance from union with pain. This Yoga should be practiced with determination and with an undespairing mind.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
tam—that; vidyāt—you should know; duḥkha-sanyoga-viyogam—state of severance from union with misery; yoga-saṁjñitam—is known as yog; saḥ—that; niśhchayena—resolutely; yoktavyaḥ—should be practiced; yogaḥ—yog; anirviṇṇa-chetasā—with an undeviating mind