Do ye look on things after the outward appearance,.... Or "look upon things", ironically said; or "ye do look on things", a reproof for making judgment of persons and things, by the outward appearance of them; so many judged of Paul by the meanness of his person, the weakness of his body, the lowness of his voice, his outward circumstances of life, his poverty, afflictions, and persecutions; and despised him; whilst they looked upon the riches, eloquence, haughty airs, noisiness, and personable mien, of the false apostles, and admired them:if a man trusts to himself that he is Christ's: is fully assured that he has an interest in his love and favour, is redeemed by his blood, is a partaker of his grace, and a believer in him; or rather, that he is a minister of the Gospel, and an apostle of Christ, one that is qualified and sent forth by him to preach the word:let him, of himself, think this again, that as he is Christ's, even so are we Christ's; that is, he may, and ought of himself, without another's observing it to him, of his own accord, willingly reason and conclude, by the selfsame marks and evidences he would be thought to be a minister of Christ, that we are also.
The sense is, that let a man be ever so confident of his being a true minister of the Gospel, he will not be able to point out one criterion or proof of his being so, but what he might discern in the Apostle Paul, and the rest of his fellow ministers, and therefore ought to conclude the same of them as of himself.