George Haydock's Catholic Bible Commentary - Romans 12:9
The apostle does not here prohibit that defence, by which a person, either by word or action, preserves himself from injury. This he could not condemn, since he had so often recourse to it himself, as we read in the Acts of the Apostles: and in the second [epistle] to Timothy, he writes: "In my first defence no one was with me." Be he only forbids that revenge which a person takes of his neighbour, by private means, without having recourse to legal authority. (Estius) read more
Hawker's Poor Man's Commentary - Romans 12:6-18
Having then gifts differing according to the grace that is given to us, whether prophecy, let us prophesy according to the proportion of faith; (7) Or ministry, let us wait on our ministering: or he that teacheth, on teaching; (8) Or he that exhorteth, on exhortation: he that giveth, let him do it with simplicity; he that ruleth, with diligence; he that showeth mercy, with cheerfulness. (9) Let love be without dissimulation. Abhor that which is evil; cleave to that which is good. (10) Be kindly... read more