John Wesley on Romans 12:9

Having spoken of faith and its fruit, Rom 12:3, &c., he comes now to love. The ninth, tenth, and eleventh verses refer to chapter the seventh; the twelfth verse to chapter the eighth; the thirteenth verse, of communicating to the saints, whether Jews or gentiles, to chapter the ninth, &c. Part of the sixteenth verse is repeated from Rom 11:25. Abhor that which is evil; cleave to that which is good - Both inwardly and outwardly, whatever ill - will or danger may follow.