But we grieve the Spirit more perhaps in matters of doctrine than anything else. We grieve Him in our lack of assurance. John says, "This is written that ye may know ye have eternal life,' and yet Christians are continually praying, "Save us at last." Do you not think that grieves the Spirit of God? We know that we are saved, not by our feelings, for they change like the waves of the sea, but because the word of the Lord hath spoken it.