Do you know your real self-interest?

The following excerpt is from a samvaad (dialogue) session with Acharya Prashant.

Questioner : A month back I asked a question on ‘numbness’, and how it affects my life. You gave me a good lesson on self-centeredness, and explained that if I am not able to do much for myself, then I should start working for others so totally, that I forget myself.