He loses knowledge of who he is because of being immersed fully in thinking about how compassionate God is. As an example, if God wanted to, He could have killed Ravana in a moment, but  devathas put forth a request with God for Him to descend to the world as a human being, wage war against Ravana and kill him there in the warfield.

ma:nusho: bhu:thva jahi ra:vanam samyuge:

God accepted the request and followed it to the dot. He took birth as a human being, went through the pain of losing mother Sitha, searched for Her in pain, waited in pain to have Her located, waged war, fought for almost a month and half during which at times he got hurt. He also fell unconscious when tied by na:gapa:sa astra. He did not act, but He actually lived like a human being. All this is a mere act of compassion.

Great bhakthas like Hanuman constantly shed tears overwhelmed by God’s compassion. Scriptures say, one’s life is blessed if one can have darsan of such bhakthas…