Set thy heart upon thy work but never upon its reward. Work not for a reward: but never cease to do thy work. Do thy work in the peace of Yoga and, free from selfish desires, be not moved in success or in failure.
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Srimad Bhagavad-Gita. 3rd century BC, ch. 2, v. 47, 48.
Bhagvad Gita As It Is: English New Edition. Bhaktivedanta Book Trust, 2015, ch. 2, v. 47, 48.