The biblical writers didn't need to say everything; they could assume some things. They didn't anticipate a day when even Jews and Christians would fall under influences of non-biblical religions, philosophies, and worldviews, to the extent that is now the case in our pluralistic culture and society.
Roger E. OlsonToday, under the influences of Eastern religions and philosophies imported into the West, many Christians confuse God's Spirit with our spirit and think our spirit is a spark of the divine, "the God within everyone." That's not how the biblical writers thought about our spirits or souls.
Roger E. Olson