Clay Christensen wrote a remarkable article, How Will You Measure Your Life? One message in particular stands out: Don’t cross the line and violate your principles, even if it’s “just this once.” As Christensen put it, “It’s easier to hold to your principles 100% of the time than it is to hold to them 98% of the time.” Once you make an exception, you’re on a slippery slope.

The IRS Just Sent Me $160,000. Can I Keep It?