The distinction is very properly made in philosophical writers between Emotions and Desires; and that joy is to be regarded as an emotion, rather than a desire. Regarded as an emotive state of the mind, joy, like the emotions generally, naturally terminates in itself. That is to say, a person may be the subject of highly raised joyful emotions, and at the same time may remain inactive. He may be wholly occupied with the ecstatic movement of his own feelings, and be destitute of thought, feeling, and action for others.— But the leading characteristic of love, that in particular which distinguishes it from mere joy, is the element of desire. It is the nature of love, as it is the nature of every thing else of which desire is the prominent element, not to stop or terminate in itself: but to lead to something else. And, furthermore, love, like other benevolent affections, is not only active in relation to others; but is active for the good of others. We have here, therefore, an important ground of distinction. If Christians were filled with joyful feelings merely, they might, being destitute of other principles of action, remain slothful at their own firesides, and see the world perish in their sins. But love, on the contrary, is sweetly and powerfully impulsive; and constrains us, especially if it be strong, to do good in every possible way to our fellow men. And hence the expression of the Apostle, "the love of Christ CONSTRAINETH us."
— edited from The Interior or Hidden Life (1844) Part 1, Chapter 14.