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In this there is no loss of effort, nor is there any harm (production of contrary results or transgression). Even a little of this knowledge (even a little practice of this Yoga) protects one from great fear.

On this path no effort is lost and no reverse occurs. Even a little of this dharma protects one from great fear.

Krishna reassures Arjuna about the path of yoga. On this path no effort is wasted, and there is no adverse result, unlike rituals that fail if performed imperfectly. Even a little practice of this dharma protects from great fear. The verse offers encouragement to anyone who doubts their ability to follow the teaching completely. What counts is the direction of one's effort, and partial progress has real value. Many readers find this one of the most hopeful lines in the chapter.