The Ishta-Deva For Bhishma

“Bhishmadeva was a pure devotee, and as a military marshal he constantly remembered the battlefield feature of the Lord as Partha-sarathi, the chariot driver of Arjuna. Therefore, the Lord's pastime as Partha-sarathi is also eternal. The pastimes of the Lord, beginning from His birth at the prison house of Kamsa up to the mausala-lila at the end, all move one after another in all the universes, just as the clock hand moves from one point to another. And in such pastimes His associates like the Pandavas and Bhishma are constant eternal companions.” (Shrila Prabhupada, Shrimad Bhagavatam, 1.9.39 Purport)