Thinking the body is a temple is an ego thought. It wants to preserve something, keep something, but nothing is your possession truly. The body is not sentient, it is nothing, just flesh, blood, bone and marrow. It's a time body that is subject to time. "Building intelligence" itself is ego, it's building onto the ego which is just thoughts that you believe in. The true self is not bound to time, it is timeless. There is no one life either, we've all likely been here countless times as other incarnations, with the ultimate incarnation being the human being who can contemplate its own existence for the purpose of awakening to the truth of its existence.
I really recommend trying that short exercise I posted. If you've ever wondered who you truly are, why am I here, what am I truly, etc., you can have those questions answered right now.