John MacArthur is a man that believes in grace through faith alone but he also believes that we should hold ourselves to a higher standard but he never ever says that you are going to lose your salvation because you didn't do a b or c he simply says we should try and that anyone who's truly saved would at least be trying to do those things and be righteous. I do feel a bit convicted when I listen to him and it rubbed me the wrong way at first but if you listen to most of his sermons which I have I don't think I have ever heard him say that you are not saved through faith alone lest any man should boast.