Process of Devotional Service: Atma-nivedanam or Surrendering

                            Q. I recently heard a lecture on the Bhagavad-Gita, Chapter 9 texts 26-34. The verses speak about offerings to Krishna, how we should make our offerings with genuine love and devotion.

                            In the Dharma book published by the BBT, Chapter 8 page 59 it says: "A spiritually advanced Krishna conscious person sees all moving and non-moving things, but he does not exactly see their forms. Rather, wherever he looks he sees the manifestation of His worshipable Lord."

                            I would like to ask about Vamana avatar. Mahabali is a pure devotee of Krishna and he ruled with all the qualities of a king; all of his people were happy with him. But Krishna came as Vamana and removed him from the earth. Why did He do so?