And I myself also. — From this point onwards the Apostle gives a personal turn to his letter. The greetings at the end are naturally introduced by a few words of explanation as to the way in which the more general exhortations that preceded are to be received by the Roman Christians, and a somewhat longer statement on the part of the Apostle of his own relations to the Church at Rome. This might seem to be the more necessary as the Church was not one of his own founding, and he might seem to be both going out of his way and acting in contradiction to his own principles in writing to them at all.
I write thus to you though you do not really need all these exhortations. Not only do others tell me, but I am convinced myself that you possess all the qualifications which would fit you to teach others instead of receiving instruction yourselves.
Ye also. — Rather, even yourselves, as you are, and without any stimulus or incitement given to you from without.
Goodness — i.e., goodness of disposition, readiness to practise all the Christian virtues, especially those to which the last section had been exhorting.
Knowledge — i.e., of the doctrinal aspects of Christianity as they had been set forth in the earlier portion of the Epistle. No doubt the Apostle had really much to teach his readers — he does not say that he had not — but he courteously gives them credit for all they knew.