Faith in God enables many of you, I know right well, to bear much hardship, and exercise much self-denial, and yet to persevere in your ministry. My heart rejoices over the many brethren here whom God has made to be winners of souls; and I may add that I am firmly persuaded, concerning many here present, that the privations they have undergone, and the zeal they have shown in the service of their Lord, though unrewarded by any outward success, are a sweet savor unto God. True faith makes a man feel that it is sweet to be a living sacrifice unto God. Only faith could keep us in the ministry, for ours is not a vocation which brings with it golden pay; it is not a calling which men would follow who desire honor and rank. We have all kinds of evils to endure, evils as numerous as those which Paul included in his famous catalogue of trials; and, I may add, we have one peril which he does not mention, namely, the perils of church-meetings, which are probably worse than perils of robbers. Underpaid and undervalued, without books and without congenial associates, many a rural preacher of the gospel would die of a broken heart, did not his faith gird him with strength from on high.
Spurgeon, An All-Around Ministry