You will never understand. I fell into the darkness because of; I had no choice, and I fell, Thor. For so long. There wasn't even darkness; there was nothing. I thought I was dying, I thought I had died, I thought Loki had ceased to be. Do you know what it is to be nothing? To regain your senses after a great lack of anything, only to meet terror incarnate?
They saw my pain, could smell my fear. And they were relatively gentle with me. They offered me great knowledge in return for something else. The Tesseract. Earth was never the end The Tesseract for Earth, for knowledge, for power.