Yogis act through the body, mind, intellect, and senses — but without attachment. And the purpose of their action? Purification of the self. Not recognition. Not reward. Purification.
Think of an elderly grandmother who sweeps the house every day — not for anyone's praise, not for any payment. It is simply her way, her discipline. In the same way, every action of the yogi becomes a means of inner cleansing.