Galatians 4:20 - Coke's Commentary on the Holy Bible

And to change my voice;— This seems to signify the speaking higher, or lower, changing the tone of the voice suitably to the matter delivered, whether it be advice, commendation, or reproof; for each of these have their distinct voices. St. Paul wishes himself with them, that he might accommodate himself to their present condition and circumstances. Dr. Heylin, however, understands it differently, and translates, that I might address you in another manner, (viva voce) for I am in great perplexity upon your account.