"But right now a righteousness from God, apart from the law, has been made known, to which the law and the prophets testify. This righteousness from God comes through faith in Jesus Christ to all who believe. There is no difference, for all have sinned and fall short of the glory of God,l and are justified freely by his grace through the redemption that came by Christ Jesus. God presented him as a sacrifice of atonement, through faith in his blood." (Romans 3:21-25)
This sums up the whole of the Gospel. All of us have fallen short of God's standard---every single one of us. There is nothing we can do to make ourselves right with God---but in His infinite mercy, He himself provided the way. God sent His one and only Son to be made the sacrifice for our sins. The only thing we need (or can) do to be reconciled with God is to accept the price that Jesus Himself paid on the Cross. Eternal life is a free gift offered to us by God Himself---free to us, because Jesus Himself paid the entire price. No other love on this earth could ever compare to that!