Brotherly Love

1 John 4:12 "No Man has at any time [yet] seen God. But if we love one another, God abides in us and His love is brought to completion in us!"

Though we have not seen the Father, we can see Him "in" us if we love one another.
http://bible.gospelcom.net/passage/?search=II%20Peter%201:5-7;&version=45;
1 John 4:20 "If anyone says, I love God, and hates his brother (in Christ), he is a liar; for he who does not love his brother whom he has seen, can not love God, Whom he has not seen."

1 John 4:21 "And this command (charge, order, injunction) we have from Him: that he who loves God shall love his brother (in Christ) also."

If we don't love the man in whom we see God then we can't possibly love God Himself.

Check out 2nd Peter 5-7 (http://bible.gospelcom.net/passage/?search=II%20Peter%201:5-7;&version=45;) and you'll find that Christian love, love of each other, is the highest goal on the path of sanctification.

If you're finding it hard to love your brethren in Christ, pray for it. Prayer is the solution. We only lack things because we fail to ask for them. James 4:2 makes this clear where the Word states "you do not have, because you do not ask." James is teaching about jealousy here, but the point is the same. See also 1 John5:14-15 http://bible.gospelcom.net/passage/?search=I%20John%205:14-15;&version=45;