You know a Christian without assurance of his salvation is about as useless, about as ineffective as a person who has no salvation for he can never be joyous and he can never be positive and he can never be aggressive. If Satan can’t keep you from being saved he’ll try to keep you from knowing for sure that you are saved. And if he can’t do that, then he will try to bring circumstances and events into your life that will so discourage you, so depress you, so overwhelm you that you are caught up in self-pity and in hopelessness and thus you are rendered ineffective in the service of God.
