'Perfection' in the Bible

But whoever obeys His Message, in him love for God has in very deed reached perfection. By this we can know that we are in Him.

No one has ever yet seen God. If we love one another, God continues in union with us, and His love in all its perfection is in our hearts.

In this [union and fellowship with Him], love is completed and perfected with us, so that we may have confidence in the day of judgment [with assurance and boldness to face Him]; because as He is, so are we in this world.

There is no fear in love; instead, perfect love drives out fear, because fear involves punishment. So the one who fears has not reached perfection in love.