A.T. Robertson Commentary Galatians 4:18

"But it is good to be zealously sought in a good matter at all times, and not only when I am present with you." — Galatians 4:18 (ASV)

To be zealously sought in a good matter (ζηλουσθα εν καλω). Present passive infinitive. It is only in an evil matter that it is bad as here (ου καλος).

When I am present (εν τω παρεινα με). "In the being present as to me."