Read Romans 15:14 Using Other Translations
And I myself also am persuaded of you, my brethren, that ye also are full of goodness, filled with all knowledge, able also to admonish one another.
I myself am satisfied about you, my brothers, that you yourselves are full of goodness, filled with all knowledge and able to instruct one another.
I am fully convinced, my dear brothers and sisters, that you are full of goodness. You know these things so well you can teach each other all about them.