A False Trust...

Now David and his men went up and made raids against the Geshurites, the Girzites, and the Amalekites, for these were the inhabitants of the land from of old, as far as Shur, to the land of Egypt. And David would strike the land and would leave neither man nor woman alive, but would take away the sheep, the oxen, the donkeys, the camels, and the garments, and come back to Achish. When Achish asked, “Where have you made a raid today?” David would say, “Against the Negeb of Judah,” or, “Against the Negeb of the Jerahmeelites,” or, “Against the Negeb of the Kenites.” And David would leave neither man nor woman alive to bring news to Gath, thinking, “lest they should tell about us and say, ‘So David has done.’” Such was his custom all the while he lived in the country of the Philistines. And Achish trusted David, thinking, “He has made himself an utter stench to his people Israel; therefore he shall always be my servant.”
(1 Samuel 27:8-12 ESV)
Fear does strange things to people.  David had withdrawn into the land of the Philistines to escape Saul's wrath. In doing so, he came up with a plan to maintain safety - pretend to be one of them.  He had hoped that by moving into a rural community, he could blend in and lay low.  There Achish could not see his every move, but he still held him accountable.  David had to do something to show his loyalty, and to earn his keep.  So he came up with this cunning plan of attacking and destroying mutual enemies of Philistia and Israel, and leaving no survivors.  On a human level, this is "pretty smart." David would have spoil to support his band of misfit toys and to pay tribute to Achish, maintaining his trust. But it was all an illusion, a smokescreen.  As we read, we can almost sense that something is going to happen, and it's not good. A false trust, based on half truths never leads to a good end.  Are you living "above board?"  Do people trust you because you have led them to believe things that are not fully true? Are you always wondering in the back of your mind: "What will happen when they find out?"  How long are you doing to let this go on?