Question: How can Lord Sri Krishna change our result if we worship Him?
Answer by Romapada Swami: Krishna does not directly involve Himself in arranging the details of karmic events in everyone’s life. As stated in the Gita (BG 9.9, BG 13.23), He is seated in everyone’s heart as though neutral, witnessing and permitting the soul’s material enjoyment as well as sanctioning sufferings which result from their own misuse of free will. Under His sanction, material nature awards the due results of their desires and actions, as they deserve.
But for those who want to become His surrendered devotee, Krishna personally orchestrates their life and guides their decisions in such a way that will bring them closer to Him (BG 10.10). In this way, the karma of a living entity is totally adjusted. For those souls who surrender unto Him, all their sinful reactions are absolved (BG 18.66). Destiny is thereby changed.