C. H. Spurgeon 
Baptismal Regeneration [EPUB ebook] 

In the preceding verse our Lord Jesus Christ gives us some little insight into the natural character of the apostles whom he selected to be the first ministers of the Word. They were evidently men of like passions with us, and needed to be rebuked even as we do. On the occasion when our Lord sent forth the eleven to preach the gospel to every creature, he “appeared unto them as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen;” from which we may surely gather, that, to preach the Word, the Lord was pleased to choose imperfect men; men, too, who of themselves were very weak in the grace of faith, in which it was most important that they should excel. Faith is the conquering grace, and is of all things the main requisite in the preacher of the Word; and yet the honored men who were chosen to be the leaders of the divine crusade needed a rebuke concerning their unbelief. Why was this? Why, my brethren, because the Lord has ordained evermore that we should have this treasure in earthen vessels, that the excellency of the power may be of God, and not of us. If you should find a perfect minister, then might the praise and honor of his usefulness accrue to man; but God is frequently pleased to select for eminent usefulness men evidently honest and sincere, but who have some manifest infirmity by which all the glory is cast off from them and laid upon himself, and upon himself alone. Let it never be supposed that we who are God’s ministers either excuse our faults or pretend to perfection. We labor to walk in holiness, but we cannot claim to be all that we wish to be. We do not base the claims of God’s truth upon the spotlessness of our characters, but upon the fact that it comes from him. You have believed in spite of our infirmities, and not because of our virtues. If, indeed, you had believed our word because of our supposed perfection, your faith would stand in the excellency of man and not in the power of God. We come unto you often with much trembling, sorrowing over our follies and weaknesses; but we deliver to you God’s Word as God’s Word, and we beseech you to receive it, not as coming from us, poor, sinful mortals, but as proceeding from the eternal and thrice-holy God; and if you so receive it, and by its own vital force are moved and stirred up towards God and his ways, then is the work of the Word sure work, which it could not and would not be if it rested in any way upon man.