From Sovereign Grace and Man’s Responsibility (sermon), on the two biblical truths of God’s election of souls and man’s responsibility to seek God.
But sinners, sermon hearing is an awful thing unless it is blessed to our souls. If God has kept on stretching out his hands every day and all the day, it will be a hard thing for you when you shall be justly condemned not only for your breaches of the law, but for your wilful rejection of the gospel. It is probable that God will keep on stretching out his hands to you until your hairs grow grey, still continually inviting you: and perhaps when you are nearing death he will still say, “Come unto me, come unto me.” But if you still persist in hardening your heart, if still you reject Christ, I beseech you let nothing make you imagine that you shall go unpunished. Oh! I do tremble sometimes when I think of that class of ministers who tell sinners that they are not guilty if they do not seek the Saviour
…This doctrine [man’s responsibility] is as much God’s Word as the other [unconditional election]. You ask me to reconcile the two. I answer, they do not want any reconcilement; I never tried to reconcile them to myself, because I could never see a discrepancy. If you begin to put fifty or sixty quibbles to me, I cannot give any answer. Both are true; no two truths can be inconsistent with each other; and what you have to do is to believe them both. With the first one, the saint has most to do. Let him praise the free and sovereign grace of God, and bless his name. With the second, the sinner has the most to do. O sinner, humble thyself under the mighty hand of God, when thou thinkest of how often he hath shown his love to thee, by bidding thee come to himself, and yet how often thou hast spurned his Word and refused his mercy, and turned a deaf ear to every invitation, and hast gone thy way to rebel against a God of love, and violate the commands of him that loved thee.