" It will hardly be wise to adopt the suggestion… that we must stop treating the little sins as though they were big sins. That suggestion means apparently, that we must not worry too much about the little sins, but must let them remain unmolested. With regard to such an expedient, it may be suggested that in the moral battle: we are fighting against a very resourceful enemy, who does not reveal the position of his guns by desultory (lacking purpose) artillery actions when he plans a great attack. In the moral battle, as in the Great European War, the quiet sectors are usually the most dangerous. It’s through the “little sins” that Satan gains an entrance into our lives. Probably, therefore, it will be prudent to watch all sectors of the front and lose no time about introducing the unity of command. "

― J. Gresham Machen , Christianity and Liberalism