We feel that our actions are voluntary when they follow a decision and involuntary when they happen without decision. But if a decision itself were voluntary every decision would have to be preceded by a decision to decide - An infinite regression which fortunately does not occur. Oddly enough, if we had to decide to decide, we would not be free to decide
When self control is lacking in small things, the ability to apply it to matters of importance withers away. Every day in which one does not at least deny himself some trifle is badly spent and a threat to the day following.