Yoga Private Lessons

Verse 3.9 Karma Yoga

yajnarthat karmano ‘nyatra loko ‘yam karma-bandhanah 
tad-artham karma kaunteya mukta-sangah samacara

The world is bound by actions other than those performed as a  sacrifice to God; do thou, therefore, O son of Kunti, perform action as a divine sacrifice alone, and be free from attachment!

If anyone does actions for the sake of the Lord, he is not bound. His heart is purified by performing actions for the sake of the Lord. Where this spirit of unselfishness does not govern the action, such actions bind one to worldliness, however good or glorious they may be.

(Source: holygita)