"Who knows what evil lurks in the hearts of men? The Shadow knows." Believe it or not, this tag line came from a radio program from the 1930's. I don't know how I even know it, since I wasn't born until 1968, but I guess it is part of pop culture enough that it is recognizable.
You know, the Shadow isn't the only one who knows. God also knows the evil desires that are lurking in the heart of men. We may put our best foot forward. We may be on our best behavior. We may look like a regular Eddie Haskell from Leave it to Beaver. ("Wally, if your dumb brother tags along, I'm gonna - oh, good afternoon, Mrs. Cleaver. I was just telling Wallace how pleasant it would be for Theodore to accompany us to the movies.")
We may be good at fooling the world around us. We may get accolades, awards, pats on the back. But on the last day, will come the day of reckoning. We'll all have to stand in the presence of God and be judged, not only on our behavior, but on the heart motive behind it. It all boils down to the heart. Because you can fool all of the people some of the time...but you can't fool God.
Who knows what evil lurks in the heart of men? God knows...that's who.
Luke 6:45 -- The good man brings good things out of the good stored up in his heart, and the evil man brings evil things out of the evil stored up in his heart. For out of the overflow of his heart his mouth speaks.
1 Corinthians 4:5 -- Therefore judge nothing before the appointed time; wait till the Lord comes. He will bring to light what is hidden in darkness and will expose the motives of men's hearts. At that time each will receive his praise from God.