The verse is related to the choices that you have made in being a Christian and upholding divine principles in your life. It also means that this choice has made you into a better person by upbuilding you so that it would be hard to have an enemy. Any person that behaves as an enemy must be a sinner so as you are loyal to God, who is also loyal to you. Notice the picture which shows how it can work to be upbuilt by God. In forcing an enemy to recognize righteous qualities in your life developed by following Christianity, this is how he/her will become like a foot stool for you.
