acts 18:28 For he mightily convinced the Jews, and that publickly, shewing by the scriptures that Jesus was Christ. - Free Bible Online

      28. For he mightily convinced the Jews--The word is very strong: "stoutly bore them down in argument," "vigorously argued them down," and the tense in that he continued to do it, or that this was the characteristic of his ministry.
      showing by the scriptures that Jesus was Christ--Rather, "that the Christ (or Messiah) was Jesus." This expression, when compared with Ac 18:25, seems to imply a richer testimony than with his partial knowledge he was at first able to bear; and the power with which he bore down all opposition in argument is that which made him such an acquisition to the brethren. Thus his ministry would be as good as another visitation to the Achaian churches by the apostle himself (see 1Co 3:6) and the more as, in so far as he was indebted for it to Priscilla and Aquila, it would have a decidedly Pauline cast.

JFB.