17 Those people are zealous to win you over, but for no good.
What they want is to alienate you [from us], so that you may be zealous for them.
18 It is fine to be zealous, provided the purpose is good,
and to be so always and not just when I am with you.
19 My dear children, for whom I am again in the pains of childbirth
until Christ is formed in you, 20 how I wish I could be with you now
and change my tone because I am perplexed
about you! NIV