whom not having known you love; in whom, though now you don't see him, yet believing, you rejoice greatly with joy unspeakable and full of glory--

 It is in the purpose of God that the Christian is called. It is by the work of the Holy Spirit that his life is hallowed towards God. It is by the sprinkling of the blood of Christ that he is cleansed from past sin and dedicated to future obedience to God. 