“You have heard that it was said, You shall not commit adultery. But I say to you that
everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.
If your right eye causes you to sin, tear it out and throw it away. For it is better that
you lose one of your members than that your whole body be thrown into hell.” (Matt 5:27-29 ESV)
By Stephen W. Hiemstra
When Jesus says “Blessed are the pure in heart”, three actions come into view: to prune, to intensify, and to apply.
Prune. Jesus says later in the sermon on the mount: “If your right eye causes you to sin, tear it out and throw it away.” (Matt 5:29) In case you are hard of hearing, he repeats the idea again in the next verse: “And if your right hand causes you to sin, cut it off and throw it away.” (Matt. 5:30 ESV). Pruning consists of removing the sin from your life.
Jesus is serious about pursuing holiness and he assumes that it is hard work. Think about the analogies that he employs—tear out your eye, cut off your hand. These are not easy actions to take. Eyes and hands are part of the body—parts of us. Still, when our lives are threatened, amputation is a acceptable option. If sin were no big deal, the analogy might have been to trim your nails or cut your hair.
Intensify. Jesus does not water down the requirements of the Mosaic law, he intensifies it. In his comments about adultery, he discounts the actual commission of the the act and focuses on the corruption of the heart. The sin begins, not with the act, but with a lustful look or intent. Billy Graham reminds us:
“What does this word adultery mean? It is derived from the same Latin root from which we get our word adulterate which means’corrupt; to make impure or to weaken.” (Graham 1955, 78).
If sin begins in the heart, then purity of heart is an absolute necessity in pursuing holiness, but more is required. We must not only avoid sin, we must focus our desires on Christ. The Apostle Paul writes:
“But that is not the way you learned Christ!–assuming that you have heard about him and were taught in him, as the truth is in Jesus, to put off your old self, which belongs to your former manner of life and is corrupt through deceitful desires, and to be renewed in the spirit of your minds, and to put on the new self, created after the likeness of God in true righteousness and holiness.” (Eph 4:20-24 ESV)
We must actually practice godliness . Paul admonishes Timothy to “train yourself for godliness” (1 Tim. 4:7 ESV) and so must we.
Apply. If the heart and mind both make us a unified person, then all of us is affected when we pursue holiness and practice godliness. In the Hebrew mindset it makes no sense to talk about faith being separated from action. When James, the brother of Jesus, writes:
“But be doers of the word, and not hearers only, deceiving yourselves. For if anyone is a hearer of the word and not a doer, he is like a man who looks intently at his natural face in a mirror. For he looks at himself and goes away and at once forgets what he was like. But the one who looks into the perfect law, the law of liberty, and perseveres, being no hearer who forgets but a doer who acts, he will be blessed in his doing.” (James 1:22-25 ESV)
James would almost certainly share Jesus’ assumption that unity of person implies unity of faith and action. In fact, one meaure of sin in this context would precisely be the amount of sunshine between what we say and what we do. After all, Jesus was the first one to use the word, hypocrite, to mean two-faced—saying one thing and doing another . Prior to Jesus, an hypocrite was an actor on the Greek stage.
This unity of faith and action reflects the unity of our Triune God whose love is simply a reflection of his person .
So we must prune, intensify, and apply if we are to be pure in heart and see God.
 Bridges (1996a, 7) writes: “The Pursuit of Holiness [also a book title] dealt largely with putting off the old self—dealing with sin in our lives. The Practice of Godliness [also another title] focuses on putting on the new self—growing in Christian character.
 “Woe to you, scribes and Pharisees, hypocrites! For you clean the outside of the cup and the plate, but inside they are full of greed and self-indulgence.” (Matt. 23:25 ESV)
 “Hear, O Israel: The LORD our God, the LORD is one. You shall love the LORD your God with all your heart and with all your soul and with all your might.” (Deut. 6:4-5 ESV)
Bridges, Jerry. 1996a. The Practice of Godliness. Colorado Springs: NavPress.
Bridges, Jerry. 1996b. The Pursuit of Holiness. Colorado Springs: NavPress.
Graham, Billy. 1955. The Secret of Happiness. Garden City, NY: Doubleday and Company, Inc.