Let's use this line, for example. This is the line of where you are in relation to God. The closer you are to being part of the world, the further you are from God.
Now, let's say that you start out here, right next to God:
Then, someone comes to you, and wants you to do something for them that would get you here:
But you refuse, but tell them that you'd only go to here:
You are still further away from God than you were when you first started, and you are still closer than the world. Pretty soon, before you know it if you continue compromising, you'll be here:
Never compromise. When you compromise, you are only moving further away from God. You cannot serve two gods. One of the wonderful things about our God is that, like the prodigal son, we can always go back to God. But when we compromise with the world, we give in to it, and we are no longer even sort of following God. If we are going to call ourselves Christians, we cannot have anything to do with the world. Romans 12:2, "Do not be conformed to this world, but be transformed by the renewal of your mind,..." This verse is showing us that we cannot be of this world, unless we are away from God. A lot of people, I've seen do this with modesty. "Well, I won't dress immodestly, unless I'm at the beach, then it's okay for me to wear a bikini." There is no compromise without sin. So please, when you get dressed, or do anything really, remember that when you aren't dressing modestly, you're dressing immodestly. You should never compromise with the world.