The Ninth Commandment addresses the inner desires of the heart, particularly the sinful inclination known as concupiscence. Because sin begins internally, believers must undergo purification through sanctification so that their hearts, thoughts, and motives align with God’s moral order. Through prayer, disciplined thinking, obedience, and wise environments, Christians grow in purity and remain in the presence of God.

Deuteronomy 5:21

“Neither shall you covet your neighbor’s wife” — Deuteronomy 5:21

Introduction

This commandment addresses not only deeds and words, but also thoughts and intentions.
God cares about the entire life of a person: actions, speech, and inner motives.
1 John 2:16–17 describes three forms of worldly desire:
- The lust of the flesh
- The lust of the eyes
- The pride of life
Lust and worldly desire are temporary and pass away with the world.
Doing the will of God leads to what endures forever.

Concupiscence

The Lust of the Flesh

Theologically, the lust of the flesh is called concupiscence.
Philosophically, concupiscence refers to intense human desire.
Theologically, it is the movement of the senses against the direction of human reason.
It involves the five senses: sight, smell, taste, touch, and hearing.
Concupiscence draws a person away from the moral order established by God.

The Moral Order of God

God’s commandments are not arbitrary rules.
The Ten Commandments express the moral order of the world.
Each commandment is interconnected with the others and with human life.
God forbids certain actions because they lead to brokenness.
His purpose is to restore humanity to a state of original grace and justice.

Concupiscence and Original Sin

Concupiscence originates from the fall of Adam and Eve.
Their disobedience broke the moral order God established.
Concupiscence inclines people toward sin.
Sin moves people beyond reason into irrationality and darkness.
Sin is destructive rather than creative.

Purification and Sanctification

The Need for Purification

Matthew 15:19–20 teaches that evil actions begin in the heart.
Jesus identifies the heart as the source of murder, adultery, theft, and false witness.
Because sin begins internally, purification of the heart is necessary.

Purity of Heart

Matthew 5:8: “Blessed are the pure in heart, for they shall see God.”
God dwells in purity and light.
Living in impurity while claiming to live in God is a contradiction.

St. Augustine on Purity

Augustine distinguishes:
- Purity of heart
- Purity of body
- Purity of mind
Belief leads to obedience.
Obedience leads to holy living.
Holy living leads to purification.
Purification leads to deeper understanding of the faith.

Purity and the Presence of God

1 Thessalonians 4:3,7–8 teaches that God calls believers to holiness.
Impurity resists and grieves the Holy Spirit.
Purity guards the presence of God within the believer.
Believers are temples of the Holy Spirit and must live accordingly.

The Purification Process

Purification is similar to the refining of gold.
Gold is purified through intense heat that removes impurities.
In the same way, God purifies the believer’s heart and soul.
This process is difficult and involves a spiritual struggle.

Strategy for Victory in the Purification Process

1. Environment

The environment strongly influences moral behavior.
Avoid situations that provoke lust or temptation.
Proverbs 6:27 warns about bringing destructive influences close.

2.Thoughts

Believers must learn to take thoughts captive.
The mortification of the flesh means putting sinful desires to death.
Romans 6 and Romans 8 emphasize putting the works of the flesh to death through the Spirit.

3.Prayer

Prayer is essential for spiritual victory.
A weak prayer life often accompanies habitual sin.
Prayer places the believer in the presence of God.
Through prayer, God gives conviction, grace, and spiritual strength.

4.Obedience

Obedience helps believers grow spiritually.
Avoid idleness and remain engaged in meaningful work.
Fulfill responsibilities in family life, work, and church life.
Reading Scripture and cultivating healthy habits support holiness.