I think it is a contradiction to the nature of things as judged of by the common sense of mankind. It is agreeable to the sense of men, in all nations and ages, not only that the fruit or effect of a good choice is virtuous, but that the good choice itself, from whence that effect proceeds, is so; yea, also the antecedent food, disposition, temper, or affection of mind, from whence proceeds that good choice is virtuous. This is the general notion–not that the principles derive their goodness from actions, but–that actions derive their goodness from the principles whence they proceed; so that the act of choosing what is good, is no farther virtuous than it proceeds from a good principle or virtuous disposition of mind. Which supposes that a virtuous disposition of mind may be before a virtuous act of choice; and that, therefore, it is not necessary there should be first thought, reflection, and choice, before there can be any virtuous disposition. If the choice be first, before the existence of a good disposition of heart, what is the character of that choice? There can, according to our natural notions, be no virtue in a choice which proceeds from no virtuous principle, but from mere self love, ambition, or some animal appetites; therefore, a virtuous temper of mind may be before a good act of choice, as a tree may be before the fruit, and the fountain before the stream which proceeds from it.
Jonathan Edwards in Original Sin as cited by Chafer, Systematic Theology, pg. 164, Vol 2.
This is exactly why Christian Hedonism has force.