Christianity has an amazing approach to lying and to anger that almost nobody else has. For truth-telling, it says truth must always be told with love. And for anger, it says, “Be ye angry, and sin not.” Paul doesn’t say, “Well if you get angry, it might be okay.” He says, “Be angry. Do it.” Very often it is wrong not to be angry. But then he turns around and says, “and sin not.” It must mean two things: that anger can easily lead to sin and trouble, and that it’s possible to be angry but not become sinful.
