Now a new theme from appears: ‘The heart is deceitful above all things, and desperately wicked: who can know it?’ The heart, the innermost thoughts and the affections, are the most deceitful thing we encounter. Our affections lie to us and deceive us more than any outside person ever did.
You can see it illustrated very well in the unbeliever, and we have all known that. The heart tells us that certain things are good objectives and pleasurable experiences, and should not be denied us. The heart says that these things that we lust after are not sins, that covetousness is not sinful, that pride is not sinful; it’s wholesome and necessary, and they give it a more attractive name: self-esteem. It says that all these things which in reality are sinful – including filthy things and perverted things – are not sinful. The heart is deceitful; it will convince you of this as an unbeliever. Should you become aware of your sin and your failure, and embarrassed at what you have said or what you have done, the heart straightaway works overtime to justify it. Of course, you were bound to lose your temper, of course you were bound to do this or do that which was a wrong reaction, because you were sorely aggravated and it was utterly unreasonable, and that sort of behaviour is not typical of you, it isn't the real you. The heart will lie to us, so that we don't come under conviction, and we don't repent. The heart is deceitful above all things, and desperately wicked.
Sadly, there are whole sections of churches that go by feelings. If it makes you feel good, it must be of the Holy Spirit; it must be good. What? Letting the affections decide what is right and what is godly and what is pleasing to the Lord, when the affections are so sick and frail, and weak before temptation? The affections should be a servant, not a ruler. If you ruled by your affections as a Christian, you are in trouble. Instead, you must let the mind do the ruling from the word of God, and take in hand your will, and instruct the affections what to feel. ‘Love the Lord’, say to your affections constantly. Put before your affections, sights of the Lord and his work and his purposes and his promises. Train your affections to love the things that are worthy to be loved. They are your servants, and they are a good servant. It is good to feel. It's good to wing your praise to heaven with the feelings cooperating and supporting, but if you let them dictate to you, they will mislead you all the time.
‘The heart [the affections] is deceitful above all things, and desperately [frail and weak]: wicked: who can know it? 10 I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.’ As one reads that it makes one think, if the Lord is searching my heart, and is judging me by my heart, and what I love, and the way my affections run, I better start searching my own heart too; I better make sure it is in order. If you had a husband or wife who was so averse to some item of dress that you wore; perhaps your wife doesn't like that gaudy jumper. It’s not her colour, so you'll avoid if you want to please her. If the Lord is going to look upon my heart then I ought to make sure it is fit to be looked on, and examine my affections. What do I love? What must I stop loving? What must I love just a little less because it's all out of proportion, and what should I love more? When we read verse 10, it makes us feel we ought to rush to our hearts and examine them, and start taking them in hand. ‘I the Lord search the heart.’ We know where he is going to search: get there first.