it is He who has also put His seal on us [that is, He has appropriated us and certified us as His] and has given us the [Holy] Spirit in our hearts as a pledge [like a security deposit to guarantee the fulfillment of His promise of eternal life].

For we know that if our earthly "house" [i.e., our physical body] which is like a tent, is torn down, we have [the promise of] a building from God, a never ending "house" in heaven that is not made by human hands.

Now He who has made us and prepared us for this very purpose is God, who gave us the [Holy] Spirit as a pledge [a guarantee, a down payment on the fulfillment of His promise].

I promise you like reward with me, as to my children.