Catena Aurea on John 12:20–26: Augustine of Hippo

But what is it to serve Christ? The very words explain. They serve Christ who seek not their own things, but the things of Jesus Christ, i. e. who follow Him, walk in His, not their own, ways, do all good works for Christ’s sake, not only works of mercy to men’s bodies, but all others, till at length they fulfil that great work of love, and lay down their lives for the brethren. But what fruit, what reward? you ask. The next words tell you: And where I am, there shall also My servant be. Love Him for His own sake, and think it a rich reward for thy service, to be with Him.