A theologian friend of mine provides a definition that I find helpful. She says that life itself is the only framework comprehensive enough to explain sin. After all, sin affects all of life. Since Jesus described himself as the One who came to give abundant life to all creation, we might think of sin as anything that robs us of the fullness of life—or something we’ve done that robs others of the fullness of life. Sin as a thief, if you will.