From Father Stephen's blog today:

In Lewis’ That Hideous Strength, his character, Mark Studdock, is pictured being tempted to lose his soul through a long string of seemingly inane choices (engineered by the infernal regions), no one of which in itself seems all that bad.
Our hearts are formed and shaped in a very small crucible. The large decisions frequently come as the fruit of many much smaller. A decision to act and live with integrity, for instance, will yield many smaller results, even surprising results.

This really rang true for me especially in two areas of my life that I am trying to change.....money and eating habits. Its so easy to convince ourselves that the the little bad choices...eating a candy bar, buying yet another skein of yarn...really aren't destructive. But they are and the cumulative weight of them inexorably pulls you down.