He will consistently make you look at those who appear to do less than you, to justify your own shortcomings. For example, if you don’t wear hijab, he’ll make you think, "There are hijabis that do x, y, z bad things! At least I don’t do those things! I do x, y, z good things that hijabis don’t do!" Or if you slacken in prayer, you may think, "At least I’m not clubbing or drinking like so and so." Remember, Allah isn’t grading on a curve. It makes no difference what others are doing. We all stand alone on the Day of Judgment.