Humility is not having a mean opinion of yourself. If a man has a low opinion of himself; it is very possible that he is correct in his estimate. I have known some people, whose opinion of themselves, according to what they have said, was very low indeed. They thought so little of their own powers that they never ventured to try to do any good; they said they had no self-reliance. I have known some so wonderfully humble that they have always liked to pick an easy place for themselves; they were too humble to do anything that would bring any blame upon them: they called it humility, but I thought “sinful love of ease” would have been a better name for their conduct. True humility will lead you to think rightly about yourselves, to think the truth about yourselves.
In the matter of soul-winning, humility makes you feel that you are nothing and nobody, and that, if God gives you success in the work, you will be driven to ascribe to Him all the glory, for none of the credit of it could properly belong to you. If you do not have success, humility will lead you to blame your own folly and weakness, not God’s sovereignty. Why should God give blessing, and then let you run away with the glory of it? The glory of the salvation of souls belongs to Him, and to Him alone. Then why should you try to steal it? You know how many attempt this theft. “When I was preaching at such-and-such a place, fifteen persons came into the vestry at the close of the service, and thanked me for the sermon I had preached.” You and your blessed sermon be hanged,—I might have used a stronger word if I had liked, for really you are worthy of condemnation whenever you take to yourself the honour which belongeth unto God only. You remember the story of the young prince, who came into the room where he thought his dying father was sleeping, and put the king’s crown on his head to see how it would fit him. The king, who was watching him, said, “Wait a little while, my son, wait till I am dead.” So, when you feel any inclination to put the crown of glory on your head, just fancy that you hear God saying to you, “Wait till I am dead, before you try on My crown.” As that will never be, you had better leave the crown alone, and let Him wear it to whom it rightfully belongs. Our song must ever be, “Not unto us, O Lord, not unto us, but unto Thy name give glory, for Thy mercy, and for Thy truth’s sake.”
Spurgeon, Charles H. The Soul Winner: How to Lead Sinners to the Saviour (Kindle Locations 474-490). Prisbrary Publishing. Kindle Edition.