1 John 4:15-19, 21

Whoever confesses and acknowledges that Jesus is the Son of God, God abides in him, and he in God. We have come to know [by personal observation and experience], and have believed [with deep, consistent faith] the love which God has for us. God is love, and the one who abides in love abides in God, and God abides continually in him. 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 [dread does not exist]. But perfect (complete, full-grown) love drives out fear, because fear involves [the expectation of divine] punishment, so the one who is afraid [of God’s judgment] is not perfected in love [has not grown into a sufficient understanding of God’s love]. We love, because He first loved us.

And this commandment we have from Him, that the one who loves God should also [unselfishly] love his brother and seek the best for him.