Jesus knew that the time had come for Him to leave this world and go to the Father. Having loved His own who were in the world, He now showed them the full extent of His love. (John 13:1 NIV)
No ministry of the servant of Jesus Christ can be a triumphant ministry unless there is a deep, strong, abiding love.... Love is going to solve our problems and to bring us into victory; but apart from a sufficient love, the problems of human make-up, the many differences of disposition and character and all that goes to make up a company, and the continuous drain and strain, with all the pressure that comes from the enemy, will present a problem, a perplexity and a paralyzing task....
We may ask, "How did the Lord manage to maintain the relationship with His disciples?" They were so difficult, so different, so disappointing. "Having loved His own... He loved them unto the end." That is the answer. Love got above all that they were; love gave the extra thing which enabled Him not to take them just as they were and end there. So in our relationships, the spirit of the true servant is only possible as there is a deep love. Upon all those who have ideas of serving the Lord and working for Him I would urge this consideration: that the work of the Lord is not some thing which you outwardly and objectively take up. It is (if it is the true thing) the outworking of love for the Lord and for those who are the objects of His love. That is very simple, but it goes to the heart of things. Sooner or later you and I will be brought to the position where the question will be, Have we sufficient love to go on? Can we find enough love in our hearts to get us through this particularly difficult situation? The situation will be constituted by all those factors which resolve us into servants, bondslaves. It would not have become so acute if only we had been esteemed and honored, and held in high regard. But when the situation is created by a great deal being expected of us, by demands being made upon our generosity, our kindness, calling for an almost inexhaustible fund of patience, and the letting go of personal feeling; when really the main issue in the crisis is this – I am being imposed upon: too much is being expected of me: I am treated as a servant – that is where we are found out. Love alone can support this service.

Don’t just pretend to love others. Really love them… Love each other with genuine affection, and take delight in honoring each other. (Romans 12:9,10 NLT)

"He loved them unto the uttermost." And I think in that statement, there is the most wonderful thing that ever came into this world. Jesus had had a lot of trouble with those men. They had often misunderstood Him. They had often disappointed Him. They were really a very poor lot of men.... He knew what a poor lot of men they were, but He loved them unto the uttermost. That is the first thing about this love. It is not offended by our failures. He does not withdraw His love because we make mistakes. We may often disappoint Him, we may often fail Him, we may often grieve His heart, but He goes on loving us. He loves us unto the uttermost, right to the end. He is not offended by our failures. That is a very different kind of love from our love. This is God's love in Christ....
You know, it is so easy to talk about love, to pretend to love, to use the language of love, to sing hymns about love, and it can all be sentimental; perhaps we all know people who have told us that they love us, but very often they are the very people who have hurt us most. Now, the love of Jesus was not sentimental, it was practical. He did not go in with His disciples and say, 'Brothers, I do love you very much.' He showed that He loved them by what He did for them. It was not sentimental love, it was practical love. And this is the love with which He loved them unto the uttermost.... These things which characterize the love of Christ for His own ought to characterize us in love for others. That is why the Holy Spirit has come. So that as He loved us to the uttermost, so ought we to love one another.