It is good to be zealously affected always in a good thing: the apostle, in the former verses, had been speaking of a great zeal, or warmth of affection, (for that zeal signifieth), which these Galatians had for and declared towards him, when he first preached the gospel amongst them; and also of a great warmth and degree of affection which these false tcachers had pretended to this church. These words are so delivered that they are applicable to either of these; but the latter words seem to make them most properly applicable to the former; so the term always is emphatical: There was a time, when you were very warm in your love to me; the cause being good, your warmth of affection ought not to have abated, but continued always, and not only while you saw me, and I was present with you.
Related Commentaries of Galatians 4:18
Galatians 4:18
18 But it is good to be zealously affected always in a good thing, and not only when I am present with you.