There is often a tendency for some in the church to be very much aware of what St. John of the Cross calls "spiritual gluttony." Such is a misunderstanding of penace so that the person finds something joyful in and of the act itself, not in moving toward God. The hymn from Wesley was written to be sung at the Lord's Supper, a fitting place to receive the true gift of Christ and offer it in excahnge to others. Hopefully, penance will be seen in light of the table.
"WITH respect to the fourth sin, which is spiritual gluttony, there is much to be said, for there is scarce one of these beginners who, however satisfactory his progress, falls not into some of the many imperfections which come to these beginners with respect to this sin, on account of the sweetness which they find at first in spiritual exercises. For many of these, lured by the sweetness and pleasure which they find in such exercises, strive more after spiritual sweetness than after spiritual purity and discretion, which is that which God regards and accepts throughout the spiritual journey. Therefore, besides the imperfections into which the seeking for sweetness of this kind makes them fall, the gluttony which they now have makes them continually go to extremes, so that they pass beyond the limits of moderation within which the virtues are acquired and wherein they have their being. For some of these persons, attracted by the pleasure which they find therein, kill themselves with penances, and others weaken themselves with fasts, by performing more than their frailty can bear, without the order or advice of any, but rather endeavouring to avoid those whom they should obey in these matters; some, indeed, dare to do these things even though the contrary has been commanded them" (From Dark Nighk of the Soul, XI).
"My Savior, how shall I proclaim, How pay the mighty debt I owe?
Let all I have and all I am Ceaseless to all Thy glory show.
Too much to Thee I cannot give; Too much I cannot do for Thee;
Let all Thy love and all Thy greif Grav'n on my heart for ever be"
(from Wesley's Hymns, No. 149."