The effect of the Spirit dwelling in our hearts is that his testimony becomes ours. His testimony is that the Father sent his Son into the world to redeem his elect, that the Son of God took our nature and was born under the law, that he fulfilled the law perfectly and earned for us perfect righteousness, that he laid down his life a ransom for our sins, that he rose from the dead proving the success of the atonement, that he ascended into heaven and returned triumphant as the God-man to his Father’s glory, and that he will come again at the last day to judge the world.