1. See what mischief sin does. (1.) It hinders God's mercies from coming down upon us; it is a partition wall that separates between us and God. Notwithstanding the infinite distance that is between God and man by nature, there was a correspondence settled between them, till sin set them at variance, justly provoked God against man and unjustly alienated man from God; thus it separates between them and God. "He is your God, yours in profession, and therefore there is so much the more malignity and mischievousness in sin, which separates between you and him." Sin hides his face from us (which denotes great displeasure, Deut. xxxi. 17); it provokes him in anger to withdraw his gracious presence, to suspend the tokens of his favour and the instances of his help; he hides his face, as refusing to be seen or spoken with. See here sin in its colours, sin exceedingly sinful, withdrawing the creature from his allegiance to his Creator; and see sin in its consequences, sin exceedingly hurtful, separating us from God, and so separating us not only from all good, but to all evil (Deut. xxix. 21), which is the very quintessence of the curse. (2.) It hinders our prayers from coming up unto God; it provokes him to hide his face, that he will not hear, as he has said, ch. i. 15. If we regard iniquity in our heart, if we indulge it and allow ourselves in it, God will not hear our prayers, Ps. lxvi. 18. We cannot expect that he should countenance us while we go on to affront him.