Romans 15:14 : And I myself also am persuaded of you, my brethren, that ye yourselves are full of goodness, filled with all knowledge, able also to admonish one another. Here Paul takes up some personal matters. One or more brethren had made a report to Paul about conditions at Rome, and expressed confidence in the brethren there; otherwise why should he say, "And I myself also am persuaded of you...." Paul felt assured that they, even with their differences about observing days and eating meats, were good people. It is likely that only a small minority were disturbed about these things. In his words of praise Paul must have had the greater part of the church in mind. "Filled with knowl-edge" could not have been well applied to those who were so disturbed about the matters discussed in chapter 14. Spiritually gifted men in that church would be able to teach and admonish the weak.
Paul's words of commendation would be encouraging to these brethren. Paul never flattered, but he did commend brethren when he had grounds for doing so. A preacher who scolds and criticizes all the time never brings out the best that is in men.