If my experience is symptomatic of a broader reality, and heart application is the most difficult of the three spheres, then it behooves us to understand potential hindrances. And the New Testament leads us to expect two primary opponents.
Legalism
The first opponent of heart application is legalism. Legalism is when we add to God’s word rules and behaviors he does not require of us. Even when such things used to be required under the old covenant, we are still “adding” them to God’s current ethical expectations (Gal 6:15-16).
Legalism was an issue when the Galatian trouble-makers taught that converts had to be circumcised and become Jews before they could become Christians. Legalism was an issue when Pharisees erected voluminous regulations for Sabbath-keeping (Luke 13:10-17) and ritual purity (Mark 7:1-5). Legalism was an issue when the Colossians and Ephesians were attracted to ascetic practices that removed them from tangible pleasures and blessings (Col 2:20-23, 1 Tim 4:1-5).
How does legalism oppose application to the heart? By producing the sort of person who does the right things without becoming the right person who believes the gospel. Legalism does not require any change on the inside, such that you become the kind of person the Lord wants you to be.
…this people draw near with their mouth and honor me with their lips, while their hearts are far from me, and their fear of me is a commandment taught by men
Isaiah 29:13
License
The second opponent of heart application is license. License is when we subtract from God’s word and minimize or ignore kingdom ethics. Even when the motivating factor is God’s grace to needy sinners, we are still subtracting from God’s word if we suppose grace does anything but train us to live self-controlled, upright, and godly lives in the present age (Titus 2:11-14).
License was an issue when Philippian citizens worshiped their belly and set their minds on earthly things (Phil 3:18-21). License was an issue when Ephesian believers were tempted to live like unbelievers, allowing hardness of heart to darken their understanding and live for what they could see, hear, feel, and touch (Eph 4:17-20). License was an issue when teachers would arise who employed the doctrine of grace to promote “anything goes” and thereby lead people away from loyalty to Christ (Jude 3-4).
How does license oppose application to the heart? By producing the sort of person who may even believe the right things but without becoming the right person who does the right things. License does not require any change on the inside, such that you become the kind of person the Lord wants you to be.
For this is the will of God, your sanctification: that you abstain from sexual immorality; that each one of you know how to control his own body in holiness and honor, not in the passion of lust like the Gentiles who do not know God.
1 Thessalonians 4:3-5
The Commonality
Both opponents of heart application—legalism and license—prevent people from becoming the right people on the inside. Both are concerned with outward behavior. Both are harsh masters, demanding far too much of their victims.
The best tactics for resisting both opponents is to properly grasp the main points of Scripture, and then to allow those truths to shape you from the inside out. To make you into not only a person who does the right things but also a person who loves and desires the right things.
See to it that no one fails to obtain the grace of God; that no “root of bitterness” springs up and causes trouble, and by it many become defiled; 16 that no one is sexually immoral or unholy like Esau, who sold his birthright for a single meal.
Hebrews 12:15-16
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