And the answer is...

The whole question is, will you please God, or please yourself? Will you give your heart to Him, or give it to your own selfish enjoyment? So long as you give your heart to selfish pleasure and withhold it from God, it will be perfectly natural for you to sin. This is precisely the reason why it is so natural for sinners to sin. It is because the will, the heart, is set upon it, and all they have to do is to carry out this ruling propensity and purpose.—Charles Finney

<idle musing>
The whole reason we don't really believe it is possible to live without sin—we don't want to. Sad, isn't it?
</idle musing>