The avatara doctrine sets Hinduism apart from the other great theisms: God does not merely send messengers but personally enters the world, repeatedly, in whatever form the crisis requires — fish, tortoise, boar, man-lion, dwarf, warrior, prince, cowherd. The standard list of ten is Vaishnava; other traditions count differently, and some modern movements have added figures to it. The theological consequence is that history is not a single arc toward one intervention but a rhythm of them, which is why Hinduism has been comparatively relaxed about accommodating new divine figures.