Galatians 4:18

But it is good to be zealously affected always in a good thing, and not only when I am present with you.

It is good to be eagerly devoted to what is truly good, and that devotion should remain constant at all times and not appear only when Paul or some encouraging person is present. Such zeal does not come in brief bursts that fade into coldness, nor shift with circumstances, but persistently presses with full effort toward a worthy end in readiness for every good word and work. Paul urges this because the Galatians were being courted by others for selfish ends, showing that zeal itself is not enough and its purpose matters. Zeal must therefore be well directed and exercised with discretion, guided by knowledge, divine truth and sound reason, with God's word as the safe guide. Without that guidance it is useless and harmful, like earnest travel in the wrong direction that will never arrive, while rightly directed it gives itself to self-denying missionary labor, active work for the salvation of others, generous giving, and persistent effort in worthy enterprises.

Paul's Pastoral Concern

The personal appeal surrounding the verse is marked by zeal and tenderness, and the concern expressed is for departure from Christ rather than for personal disaffection. In Galatians 4:12-20 the appeal urges a return to faithfulness and warns against others who court for selfish ends in order to gain advantage from that turning away. Zeal is good when directed toward what is good, and such zeal should be constant rather than shown only when Paul is present, so that zeal itself is not enough and its purpose matters.

The verse stands within the argument about being under law or under grace, in which sin is forgiven by grace so that the law no longer condemns the believer. Grace also leads to obedience, with God's law cherished in the heart.

The wider passage in Galatians 4:9-21 does not condemn keeping the seventh-day Sabbath of the fourth commandment. Returning to weak and beggarly elements and desiring to be under the law means keeping the ceremonial law written by Moses and placed beside the ark, not the law spoken by God, engraved on stone, and placed in the ark. That Mosaic law is the body of law contained in ordinances that was contrary, a law of enmity taken out of the way at the cross. Keeping God's precepts is not a curse and keeping its principles is not a return to weak elements, while keeping the Mosaic law leaves a person where Christ's atonement profits nothing.

Constant Zeal for Good

It is good to be zealously affected when the thing is good, for zeal itself is approved only as it is directed toward what is good. That zeal should be constant and always maintained, not shown only when Paul is present nor only when some particular person is present to encourage it. It is to be sustained rather than occasional, abiding at all times instead of appearing merely under watchful encouragement.

Steady zeal does not come in occasional bursts or change with circumstances, but persists with full effort aimed at a worthy end. It does not shift between serving God and serving Satan, but remains always directed toward a good cause. Zeal for good spiritual things should not be a brief burst that gives way to coldness and inactivity, but a steady readiness for every good word and work rather than zeal shown only now and then.

Remaining zealous at all times does not require Christian feeling or ardor to stay at the same intensity. Christian sanctification itself should continually progress even while zeal is maintained without unvarying emotional height. The verse commends enthusiasm in the right direction, calling Christians to bring their energy and abilities to promoting what is true and worthy.

Zeal Guided and Applied

It is good to be zealous only when that zeal is aimed at what is good, and it must be well directed and exercised with discretion. Such zeal is to be guided by knowledge, by divine truth and sound reason, with God's word as the safe guide. Letting light shine does not mean speaking indiscriminately to everyone.

Zeal is very necessary to the accomplishment of anything, yet zeal without knowledge is useless. It is like a wild horse without bit or bridle, with plenty of activity to no purpose, or like traveling earnestly south when the destination lies north, which will never arrive. Ignorance nullifies zeal, as Israel shows by having zeal and the highest profession of serving God while ignorant of God's righteousness.

Zeal driven by impulse or imagination and treated as divine inspiration is not guided by knowledge, and it can lead to error, damage the cause of Christ, and drive people from God. Zeal that lacks direction can harm the one who has it and hinder God's cause. Zeal must therefore be according to knowledge and directed by wisdom in winning souls to Christ.

Zeal exercised as a ruling passion for argument, without gentleness, meekness, and Christian manner, injures rather than advances God's cause, sours and prejudices minds, and retards the Lord's work. True zeal is wise as a serpent and harmless as a dove, speaks at the right time and place, watches and prays, and lives near to God. A blameless life and well-doing speak louder than a multitude of words.

Christian enthusiasm is earnestness in Christian life and work in which right purpose is filled with Christian feeling, the intelligent zeal of one who loves Christ and longs to do His will. Jesus showed it in His whole public ministry and in making doing His Father's will His food and drink. Paul lived it in outworking his fellow apostles and going unflinchingly through every hardship to martyrdom itself. Vast numbers have kept that burning, self-devoted love on the altar of the heart, and mainly by the lives and labors of such earnest ones Christianity has become an effective force, steadily advances, and stands erect extending its influence on every side.

The zeal commended is applied to self-denying missionary labor for the gospel even at the cost of comfort or life, since self-denying commitment enables great labor for the gospel. It is applied to being actively engaged in salvation and helping others encounter the truth through each person's gifts and opportunities. Giving resources to help God's servants share the truth is also a way of obeying the command. It is applied as well to persistent effort in worthy enterprises such as making a school and its journal worthy.