Adam Clarke on Romans 1:8

First, I thank my God - From this to the end of Rom 1:17 belongs to the preface, in which the apostle endeavors to conciliate the good opinion of the Christians at Rome, and to prepare their minds for his reproofs and exhortations.

Your faith is spoken - καταγγελλεται, is celebrated, throughout the whole world - in every place where the Christian religion is professed, through all parts of the Roman dominions; for in this sense we should understand the words, the whole world.