Today my Junior Highers learned about assurance. We studied the Shorter Catechism Question #36, and spent a good long while talking about those things we are sure of—2+2=4, gravity, and this nasty disease that seems to affect only women. Again, I turned to Thomas Watson’s Body of Divinity in helping my understanding of this doctrine. Here is what he says about assurance:
How should they conduct themselves who have assurance?
1) If you have assurance of your justification, do not abuse it…we abuse assurance when we grow presumptuous and less fearful of sin…It is bad to sin when one wants assurance, but it is worse to sin when one has it. We abuse assurance when the pulse of our souls beats faster in sin, and slower in duty.
2) If you have assurance, admire [God’s] stupendous mercy. You deserved that God should give you gall and vinegar to drink, and has he made the honeycomb of his love to drop upon you? Oh, fall down and adore his goodness!
3) Let your hearts be endeared in love to God. Has God brought you to the borders of Canaan, given you a bunch of grapes, crowned you with lovingkindness, confirmed your pardon under the broad seal of heaven? How can you be frozen at such a fire? Say as Augustine “I would hate my own soul, if I did not find it loving God!”
4) If you have assurance, (i) improve it for God’s glory by encouraging such as are yet unconverted. Tell them how sweet this hidden manna is; tell them what a good master you serve; what gales you have had; tell them God has carried you to the hill of myrrh, to the mountains of spices; he has given you not only a prospect of heaven, but an earnest. (ii) Improve assurance, by walking more heavenly. You should scorn the things below; you who have an earnest of heaven, should not be too earnest for the earth. You have angel’s food; and it becomes not you, with the serpent, to lick the dust. (iii) Improve assurance by a cheerful walking. It is for condemned persons to go hanging down their heads. But hast thou thy absolution? Does thy God smile on thee? Cheer up!
5) If you have an assurance of salvation, let it make you long after a glorified state. The soul that has tasted how sweet the Lord is, should long for a fuller enjoyment of him in heaven. Be content to live, but willing to die.
6) If you have assurance, be careful you do not lose it. Keep assurance first by prayer (Psalm 36:10); secondly by humility. Paul had assurance, and he baptised himself with the name ‘Chief of sinners.’ The jewel of assurance is best kept in the cabinet of a humble heart.
The Apostle Peter exhorts us to make our calling and election sure. Many times I see in my own heart a vacillation like that of David, who says one time: ‘Thy lovingkindness is before my eyes’ (Psalm 26:3) and then another ‘Lord, where are thy former lovingkindnesses?’ (Psalm 89:49). I have come to realise that assurance is not like justification or adoption—instantaneous; oh, that it would be! Rather, for me at least, assurance is a varied process whose goal is to be able to say with surety: “my only comfort in life and in death is that I am not my own, but belong—body and soul, in life and in death—to my faithful Saviour Jesus Christ!”