Charles Ellicott Commentary 1 Thessalonians 1:8

"For from you hath sounded forth the word of the Lord, not only in Macedonia and Achaia, but in every place your faith to God-ward is gone forth; so that we need not to speak anything." — 1 Thessalonians 1:8 (ASV)

For.—“For, in fact,” (supporting and exceeding the statement of 1 Thessalonians 1:7 about Greece) “you form the centre from which the doctrine of Christ has rung (not rang) out like a trumpet through those countries; and even beyond, your faith is well known.” The clauses are not quite logically balanced.

Your faith does not mean “your creed,” but “the report of your extraordinary faith.”

To say anything—i.e., about our success at Thessalonica.