Verse 6. By pureness. Paul, having in the previous verses grouped together some of the sufferings which he endured, and by which he had endeavoured to commend and extend the true religion, proceeds here to group together certain other influences by which he had sought the same object. The substance of what he here says is, that it had not only been done by sufferings and trials, but by a holy life, and by entire consecration to the great cause to which he had devoted himself, he begins by stating that it was by pureness, that is, by integrity, sanctity, a holy and pure life. All preaching and all labours would have been in vain without this; and Paul well knew that if he succeeded in the ministry, he must be a good man. The same is true in all other professions. One of the essential requisites of an orator, according to Quintilian, is, that he must be a good man; and no man may expect ultimately to succeed in any calling of life unless he is pure. But however this may be in other callings, no one will doubt it in regard to the ministry of the gospel.

By knowledge. Interpreters have differed much in the interpretation of this. Rosenmuller and Schleusner understand by it prudence. Grotius interprets it as meaning a knowledge of the law. Doddridge supposes that it refers to a solicitude to improve in the knowledge of those truths which they were called to communicate to others. Probably the idea is a very simple one. Paul is showing how he endeavoured to commend the gospel to others, 2 Co 6:4. He says, therefore, that one way was by communicating knowledge, true knowledge. He proclaimed that which was true, and which was real knowledge, in opposition to the false science of the Greeks, and in opposition to those who would substitute declamation for argument, and the mere ornaments of rhetoric for truth. The idea is, that the ministry should not be ignorant; but that if they wished to commend their office, they should be well-informed, and should be men of good sense. Paul had no belief that an ignorant ministry was preferable to one that was characterized by true knowledge; and he felt that if he was to be useful, it was to be by his imparting to others truth that would be useful. "The priest's lips should keep knowledge," Mal 2:7.

By long-suffering. By patience in our trials, and in the provocations which we meet with. We endeavour to obtain and keep a control over our passions, and to keep them in subjection. See this word explained See Barnes "1 Co 13:4".

By kindness. See Barnes "1 Co 13:4".

By gentleness of manner, of temper, and of spirit. By endeavouring to evince this spirit to all, whatever may be their treatment of us, and whatever may be our provocations. Paul felt that if a minister would do good, he must be kind and gentle to all.

By the Holy Ghost. By the sanctifying influences of the Holy Spirit. By those graces and virtues which it is his office peculiarly to produce in the heart. Comp. Ga 5:22,23. Paul here evidently refers not to the miraculous agency of the Holy Spirit, but he is referring to the Spirit which he and his fellow-ministers manifested -- and means here, doubtless, that they evinced such feelings as the Holy Spirit produced in the hearts of the children of God.

By love unfeigned. Sincere, true, ardent love to all. By undissembled, pure, and genuine affection for the souls of men. What good can a minister do, if he does not love his people and the souls of men? The prominent characteristic in the life of the Redeemer was love -- love to all. So if we are like him, and if we do any good, we shall have love to men. No man is useful without it; and ministers, in general, are useful just in proportion as they have it. It will prompt to labour, self- denial, and toil; it will make them patient, ardent, kind; it will give them zeal, and will give them access to the heart; it will accomplish what no eloquence, labour, or learning will do without it. He who shows that he loves me has access at once to my heart; he who does not, cannot make a way there by any argument, eloquence, denunciation, or learning. No minister is useful without it; no one with it can be otherwise than useful.