"By the which will we be sanctified through the offering of the body of Jesus Christ once for all." (Hebrews 10:10 KJV)
""I am praying not only for these disciples but also for all who will ever believe in me through their message. I pray that they will all be one, just as you and I are one - as you are in me, Father, and I am in you. And may they be in us so that the world will believe you sent me. I have given them the glory you gave me, so they may be one as we are one. I am in them and you are in me. May they experience such perfect unity that the world will know that you sent me and that you love them as much as you love me."" (John 17:20-23 NLT)
Looking at this from a different direction, there are several things that I feel could be challenging to just about anyone of us, if we don't learn how to love one another. There are several points of view on the way that works; some of which will say it is really not possible to learn love, that it is something given to us by God. Well, if that is something you believe, then why does God need to teach us how to love one another, instead of just giving us the ability to love as we should?
If you don't understand what I am talking about, learning to love, think about this basic principle of how God makes this work. If you pray for God to help you love others as you should, does He make them all warm and fuzzy towards you, or does He challenge you to love them unconditionally, as He loves you?
Hypothetically speaking, the Holy Spirit within us is able to assist us to love; but to be perfectly true to the facts of life, sometimes we don't want to do what we should, even when we are told to do it. The Holy Spirit is a Helper and Comforter, but when it comes to relationships and differences, there are times when we don't want help or comfort; we want justice and want to be proven right.
If you look at the prayer Jesus is asking for us, believers, the thing that He says repeatedly, is about being one; one is the thing we seldom think about when have conflict with one another. Instead, we break off the oneness, forgetting that each part of the body of Christ is needed! Whatever it is that is making you not love as you should, it is best to embrace it, own it, and then give it to God! That is how you learn to love! It might be easy, but it is hard to learn...
"And so, dear brothers and sisters, I plead with you to give your bodies to God because of all he has done for you. Let them be a living and holy sacrifice - the kind he will find acceptable. This is truly the way to worship him. Don't copy the behavior and customs of this world, but let God transform you into a new person by changing the way you think. Then you will learn to know God's will for you, which is good and pleasing and perfect. Because of the privilege and authority God has given me, I give each of you this warning: Don't think you are better than you really are. Be honest in your evaluation of yourselves, measuring yourselves by the faith God has given us. Just as our bodies have many parts and each part has a special function, so it is with Christ's body. We are many parts of one body, and we belong to each other." (Romans 12:1-5 NLT)