This is an excerpt from my presentation of Bhagavad Gita, 18.7-10.
Arjuna: You mentioned three grades of renunciation. What are they?
Krishna: Out of confusion, those in darkness (tamas) give up responsibilities that should never be forsaken.
Passionate people (rajas) give up difficult and disturbing responsibilities that get in the way of their bodily comfort. This will never grant the fruit of true renunciation.
Those in clarity (sattva) carry out their responsibilities thinking, “This is my duty.” They renounce any connection to the rewards of these actions. They don’t detest unpleasant work, nor are they particularly attached to pleasant deeds. These intelligent people are free of all doubts and completely clear about renunciation.
A Simple Gita 