William Burkitt on Romans 10:1

Where observe, 1. The mighty concern which the apostle had for the eternal salvation of his countrymen the Jews, who sought his destruction; their salvation lay very near his heart, and he was afraid they should miss it by taking the wrong way for obtaining it, by building all their hopes of salvation upon such a bottom as would never bear the fabric, but utterly fail them; namely, justification by works.

Observe, 2. What it was that made the apostle so concerned for the Jews. It was not upon the account of their wicked lives and scandalous immoralities, but for their bad principles and fundamental errors. They opposed the honour of God to the Son of God, and the observation of the law to the faith of Christ.

From whence learn, That we ought to be concerned for those who lie under damnable errors, although they be men of good carriage and commendable conversation. Not only the vicious and ungodly, but the erroneous and unsound, are to be the objects of our pity and prayer; for error is as damnable as vice; the one is an open road, the other a by-path, to hell and destruction; and, accordingly, he that has a due care of his soul's salvation will be as much afraid of erroneous principles as of debauched practices.