Casy remarks: “Maybe all men got one big soul everybody’s a part of.” How is this similar to the concept of the over soul and Transcendentalism?

The concept of Transcendental involves the "Oversoul" or the belief that all human's souls are part of a larger soul. The Oversoul is a universal spirit that lives symbiotically. Casey thinks that human greed and need to discriminate keeps humanity from achieving the universal spirit.