Actually, it causes them discomfort because they know they are wrong and that what you are doing is right. Human nature is evil, but we are imbued with a sense of God and right and wrong whether we follow our inner selves or not. The saying is meant to demonstrate this part of our nature and comes from Go Himself. The Bible contains all the wisdom and instructions for life that we need.
God Bless.
Did Hillary moon him from the front?