I think we shall all agree that labor in vain cannot be continued for ever if we consider _the ploughman_. He does not want to be much considered; but still his Master does not overlook him. See how weary he grows when the work discourages him. He goes to his Master with, "Who hath believed our report, and to whom is the arm of the Lord revealed?" "Why hast thou sent me," says he, "to a people that have ears but hear not? They sit as thy people sit, and they hear as thy people hear, and then they go their way and they forget every word that is spoken, and they obey not the voice of the Lord." See how disappointed the preacher becomes. It is always hard work when you appear to get no forwarder, although you do your utmost. No man, whoever he may be, likes to be set upon work which appears to be altogether a waste of time and effort. To his own mind it seems to have a touch of the ridiculous about it, and he fears that he will be despised of his fellows for aiming at the impossible. Shall it always be the lot of God's ministers to be trifled with? Will the great Husbandman bid his ploughmen spill their lives for nought? Must his preachers continue to cast pearls before swine? If the consecrated workers are so bidden by their Lord they will persevere in their painful task; but their Master is considerate of them, and I ask _you_ also to consider whether it is reasonable to expect a zealous heart to be for ever occupied with the salvation of those who never respond to its anxiety? Shall the horses always plough upon the rock? Shall the oxen always labor there? Again, there is _the Master_ to be considered. The Lord--is he always to be resisted and provoked? Many of you have had eternal life set before you as the result of believing in Jesus; and you have refused to believe. It is a wonder that my Lord has not said to me, "You have done your duty with them; never set Christ before them again; my Son shall not be insulted." If you offer a beggar in the street a shilling and he will not have it, you cheerfully put it into your purse and go your way; you do not entreat him to have his wants relieved. But, behold, our God in mercy begs sinners to come to him, and implores them to accept his Son. In his condescension he even stands like a salesman in the market, crying, "Ho, every one that thirsteth, come ye to the waters, and he that hath no money; come, buy wine and milk without money and without price." In another place he says of himself, "All day long have I stretched out my hands to a disobedient and gainsaying generation." If the Lord of mercy has been refused so long in the sight of you who reverence him, does not some indignation mingle with your pity, and while you love sinners and would have them saved, do you not feel in your heart that there must be an end to such insulting behavior? I ask even the careless to think of the matter in this light, and if they do not respect the ploughman, yet let them have regard to his Master.