The surest symbol of a heart not yet fully subdued to God and His will is going to be found in the areas of money, sex, and power: in wanting these things for ourselves. The surest symbol of spiritual earnestness will be the checkbook, the affections, and the ego-drive surrendered to Him. A disciple must have discipline. He must not be afraid of being asked by God for some of the time, the money, and the pleasure he has been in the habit of calling his “own.” This does not mean that there will not be time for the family, and time for some healthy diversion. But it does mean that we are never—on vacation, or wherever we may be—exempt from our primary commitment to Him.

…Samuel M. Shoemaker (1893-1963), The Experiment of Faith [1957]