>Soul and spirit are interchangable. Man's sin is thinking he could be like God knowing everything, trying to build a tower to heaven, marveling in his own works instead of God's works.
>No, they are not, or there would be no word for soul. The human spirit keeps the human body alive, as the animal spirit keeps the animals alive. Instinct, involuntary responses, etc. The soul is your true self temporarily living in this meat puppet, is eternal, and is self aware, as you are, and can do thing animals cannot do, such as believe things you have not seen.
Watchman Nee has developed a system of belief about the distinction between the two. Has anyone read it?