Some indeed preach Christ even of envy and strife; and some also of good will: Some - preach Christ even of envy and strife - These must have been the Judaizing teachers, who insisted on the necessity of connecting the Mosaic rites with the Christian institutions; and, probably, denounced Paul to the Jews dwelling at Rome as not only an enemy to the law and the prophets, but also as a very imperfect Christian, because he declared strongly against the doctrine of circumcision, etc.; and no doubt endeavored to prejudice him with the heathen Romans.
The word preach is not to be taken here as implying that the different persons mentioned were what we call preachers of the Gospel: all that we can understand from St. Paul's use of the word is, that they proclaimed Christ as the promised Messiah, espoused the Christian cause, and contended, whether in public or private, that this Jesus was the Christ; but nothing of this kind appears to have been intended in reference to the conversion of sinners.
Some also of good will - Some, through mere benevolence to the apostle, both espoused his doctrine and vindicated his cause.