Ephesians 1:14 NLT The Spirit is God’s guarantee that He will give us the inheritance He promised and that He has purchased us to be His own people. He did this so we would praise and glorify Him.
The Holy Spirit of God is God’s guarantee that we belong to Him and that He will do what He has promised. The Holy Spirit is like a down payment, a deposit, a validating signature on the contract. The presence of the Holy Spirit in us demonstrates the genuineness of our faith, proves that we are God’s children, and secures eternal life for us. His power works in us to transform us now, and what we experience now is a taste of the total change we will experience in eternity.