“And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces that their fasting may be seen by others. Truly, I say to you, they have received their reward.” – Matthew 6:16
In other words, the danger of hypocrisy is that it is so successful. It aims at the praise of men. And it succeeds. But that is all.
– John Piper A Hunger For God (Wheaton, Il: Crossway 1997), 71.