“And I will ask the Father, and he will give you another advocate to help you and be with you forever — the Spirit of truth. The world cannot accept him because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. (John 14:16-17, NIV)
I’ve forgotten my wallet. I’ve forgotten my cellphone. I’ve forgotten my attache case; but I’ve never once forgotten my heart, my lungs, or even my “who knows what it does” appendix. All of these latter-named items are securely within us.
So it is with the Holy Spirit. Jesus tells us that He is here to help us forever; that He lives with us; and that He lives within us.
How cool is that? We have an eternal Helper. He lives with us. He lives within us; as surely and securely as our physical organs.
The Holy Spirit is not merely a gift from God; He is the gift of God. We can never lose this gift, but we can choose not to allow Him to help us — but why would we do that? – Luther