There are reasons why an enlightened being might want to help others. What I'm trying to say is that the enlightened avatars and the Buddha's and all are enlightened beings. It's not that they don't know this and they have not realized it. They have, and from that point of view they want to help us. But in the absolute also, see, there might feel, I've given the example of the wave and the ocean.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Mantra 7 (Part 2).