CONCENTRATION

As it turned out, for sure you'll find that strange thoughts, aggressively try disvirtue than it is trying to do., It is the fact that your mind is undisciplined.
You should not resist, he will let it go away soon, but secure in what you are doing, force your mind to think what you want, as few things that are good, intelligent, positive and love of neighbor.
Maybe you have a long time to discipline your mind, but surely master this technique.
Peace in the Lord Jesus Christ and remember that above its dark clouds have a clear blue sky and the clouds will dissipate in no time!