“My son, attend to my words; incline thine ear unto my sayings. Let them not depart from thine eyes; keep them in the midst of thine heart. For they are life unto those that find them, and health to all their flesh. Keep thy heart with all diligence; for out of it are the issues of life.” — Proverbs 4:20-23
Below are some really good snippets I pieced together from a sermon by Phil Johnson titled: Wisdom Guards the Heart. It is an excellent sermon. You can listen to (and download, if you so desire) the entire thing here.
“It’s not easy to keep our thoughts pure and holy, but our sinful thoughts are the first and most important sins we are called to crucify, mortify, put to death. We saw that a little bit this morning. Remember, Jesus taught that those sinful thoughts are the source and the fountain of all the evil that defiles us. That’s interesting, isn’t it? I mean, Scripture—and Jesus here—is explicitly teaching that you’re not defiled by sin that rubs off on you from the outside. Think of it. Jesus, perfectly sinless, came to this earth, dwelt among sinners as a man, and the sin that He lived in the midst of, none of it rubbed off on Him. Why? Because there was no sin coming from within to defile him. The truth is, our own sinful thoughts, what emanates from our own heart, that is the source of every problem we have. That’s what defiles us.
When the apostle Paul commands us to mortify the sin that’s in our members, his focus is not on external deeds—I read you that verse this morning, Colossians 3:5—but what he does in Colossians 3:5, when he says, “Mortify the sin that’s in your members,” he gives a long list of the kinds of sin that, basically, come out of the thought life. Sins that are hatched in an unholy heart; fornication, uncleanness, inordinate affection, covetousness, evil concupiscence—these are all sins that occur in the mind! They are sins of the passion and of the mind. So, the process of mortifying sin, as we saw this morning, involves getting control of the mind, the imagination, the passions, the heart. Paul is calling for internal purification when he says, “Mortify the sin that is in your members.” He’s not calling merely for the reformation of our external behavior—you understand that, right? He’s not saying what your mother meant, when you were a child and she said, “Behave!” She meant, “Act nice.” Paul means, “Think nice.” That’s how sanctification works.
The focus on sanctification, in Scripture, is always about purifying the heart and renewing the mind. We’re transformed by the renewing of our mind. The outworking of our sanctification, naturally then, results in a change of behavior. But a change of behavior, without the renewal of the heart, is not sanctification at all. In fact, it’s a form of hypocrisy—and I’ll have more to say about that as we go, but first, let me give you some practical steps for guarding your heart. How can we do this? What precisely does this verse require of us? “Keep thy heart with all diligence”—what does that mean? Scripture gives us some clear guidelines for “keeping our heart” and I want to outline just the basics for you. . .
Mortify your evil thoughts…“Mortify, therefore, your members which are upon the earth…fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry,”…this is a recurring theme in the Apostle Paul’s writings, this idea of putting to death sin in your body, mortifying the sin. Romans 8:13, “If you live after the flesh, you shall die; but if you, through the Spirit, do mortify the deeds of the body, you shall live.” What he’s saying is this: put your evil thoughts to death. Deal with them ruthlessly. Don’t allow them any breathing room. Choke the life out of them. Mortify them. Romans 13:14, “Put ye on the Lord Jesus Christ and make not provision for the flesh, to fulfill the lusts thereof.”
By the way, this is one of the marks of the true Christian. Galatians 5:24 says, “They that are Christ’s have crucified the flesh with the affections and lusts.” We haven’t done it perfectly. It’s a process of crucifixion, and that’s a slow death, so those affections and lusts continually come back to plague us; but if you are truly a believer, then at some point and in some way, you have begun the process of crucifying these lusts and affections.
And Paul says continue the process. Carry it through to the end, because sinful thoughts are a fierce, deadly enemy that must be met with lethal force, choked out of existence, rooted up, exterminated, and utterly purged from our lives. That’s the only way to deal with sin in your life—any sin. Understand what Jesus was saying when He said, “All that defiles you comes from your heart,” He’s saying that every sin that troubles you is hatched in your mind! If you can control your mind, if you can mortify that sin that’s in your mind, that is the pathway to sanctification. If you don’t do that, every wicked thought will destroy you, if you don’t destroy it. And you’ll never get control of your thought life if you’re not proactive, deliberate, ruthless in mortifying and putting to death the sin that’s in your heart. . .
. . .Put restraints on your heart that will keep you from entertaining iniquity in that private arena of your own mind. Put restraints on your heart—you can shorten your version to just that—put restraints on your heart. Get rid of evil influences. Don’t watch movies or read novels that fill your mind with wickedness. Have some self-control in what you expose yourself to; in biblical terms, “exercise yourself rather unto godliness.”
Look at the context of our verse now. Proverbs 4—you should have turned there—Proverbs 4:20—go back to verse 20: “My son, attend to my words; incline thine ear unto my sayings. Let them not depart from thine eyes, and keep them in the midst of thine heart, for they are life unto those that find them and health unto all their flesh.” And then our verse, “Keep thy heart with all diligence, for out of it are the issues of life.” Verse 24, “Put away from thee a froward [or deceitful mouth], and perverse lips put far from thee. Let thine eyes look right on, and let thine eyelids look straight before thee. Ponder the path of thy feet, and let all thy ways be established. Turn not to the right hand or the left; remove thy foot from evil.” There’s lots of sound advice about how to guard your heart in that passage I just read. Look at it closely.
First of all, if you want to guard your heart, you have to guard your ears, verse 20, “Attend to my words; incline thine ear to my sayings.” Be careful what you fill your ears with. This verse suggests that the focus of your hearing ought to be the wisdom of God’s Word. Be attentive. Incline your ears to these sayings. I’m amazed at what some Christians fill their ears with. I could probably tell a lot about the state of your sanctification just by checking the presets on your car radio, right? I mean, what that tells me is what you listen to when you’re alone and can choose to listen for yourself. What do you tune into? What do you tune into? The shock jocks with their off-color humor and the angry ranting of certain drive time radio personalities? Do you gravitate to music that’s profane and full of iniquity? I always wonder why would a Christian ever want to fill his ears with profanity and lewdness, and how can a godly person derive enjoyment from those things?
Now, I’m not suggesting that all secular music or humor is evil, but I am saying, shouldn’t our listening be dominated by that which edifies? This passage seems to say so. Our ears ought to be inclined to the truth of the Word of God. If that’s not the focus and predominance of what you listen to when you’re alone, with time to think and meditate, then you’re probably not doing a very good job of guarding your heart. . .
. . .Guard your eyes, verse 21: “Don’t let the truth depart from your eyes” and that’s also echoed in verse 25: “Let thine eyes look right on, and let thine eyelids look straight before thee.” Keep your eyes where they ought to be or you won’t be able to keep your heart where it ought to be—that’s a simple principle. Jesus said, in Matthew 6:22-23, “The lamp of the body is the eye. If, therefore, your eye is good, your whole body will be full of light; but if your eye is evil, your whole body shall be full of darkness.” That’s a good reason not to watch some of the stuff we watch, isn’t it? Our culture constantly bombards us with images and entertainment deliberately designed to appeal to the lust of the eyes, and if you don’t know when to turn away and refuse to watch, you aren’t doing a very good job of guarding your heart.
And I’m not speaking only about that which is overtly evil. That’s a given. I shouldn’t even have to make that point. But much of what we watch is simply a waste of time! That is as detrimental to us, spiritually, as watching evil things, because it fills our hearts with vain thoughts. The Psalmist wrote in Psalm 119:37, “Turn away mine eyes from looking at worthless things.”
