You internalize the rationalizations for the work you are doing. It’s easier to think that underwriting new debt offerings really is saving the world than to think that you are underwriting new debt offerings, because of the money, instead of saving the world. And this goes for many walks of life. It’s easier for college professors to think that, by training the next generation of young minds (or, even more improbably, writing papers on esoteric subjects), they are changing the world than to think that they are teaching and researching instead of changing the world.This is a particularly poignant for Christians, since we have a divine mandate to do something meaningful with our lives, not just a hunch that we ought to. If we turn our backs on self-sacrificing lifestyle choices, we're writing off far more than youthful ideals.
Hat tip to Thesus.