Cheaters never prosper. Liars never win. Those are just a few phrases that come to mind.
What am I talking about? What's done in the dark will come to light? It's inevitable. If you try to do things in a sneaky or conniving manner, it won't stay a secret for long.
That means the people trying to "get over on you" or "take advantage of you" will not win! You are God's child. That person may think they've won the battle but remember who wins the war!