samah siddhav asiddhau ca
krtvapi na nibadhyate
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
He who is satisﬁed with gain which comes of its own accord, who is free from duality and does not envy, who is steady in both success and failure, is never entangled, although performing actions.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
A Krishna conscious person does not make much endeavor even to maintain his body. He is satisﬁed with gains which are obtained of their own accord. He neither begs nor borrows, but he labors honestly as far as is in his power, and is satisﬁed with whatever is obtained by his own honest labor. He is therefore independent in his livelihood. He does not allow anyone’s service to hamper his own service in Krishna consciousness. However, for the service of the Lord he can participate in any kind of action without being disturbed by the duality of the material world. The duality of the material world is felt in terms of heat and cold, or misery and happiness. A Krishna conscious person is above duality because he does not hesitate to act in any way for the satisfaction of Krishna. Therefore he is steady both in success and in failure. These signs are visible when one is fully in transcendental knowledge.
[To hear more on this verse, visit – http://bhagavadgitaclass.com/bhagavad-gita-chapter-04-text-22/]