Shall iron break the northern iron and the steel? – Jeremiah 15:12
Not by might, nor by power, but by My spirit, saith the LORD of hosts. – Zechariah 4:6
Man’s heart is very hard; it is like the northern iron and the steel. Our preaching—we try to make it forcible, but how powerless is it of itself! The preacher seeks goodly words and illustrations; he brings forth the law of God, he gives forth threatenings in God’s name; he reasons concerning judgment to come, and flinches not from declaring the eternal punishment of sin; he preaches the love of God, and the infinite mercy of Christ Jesus, and he blends all this with an affection which longs for conversion, and he prays for God’s blessing; but in many, many hearts there is no change, the northern iron and the steel remain unmovable…Children of God, you are driven to this, that here is a case in which you are powerless. You might as well reverse the wind, or move a star, or create a world, as soften these hardened hearts. What are you then to do? Certainly, you are to continue the effort; nothing must tempt you to relinquish it, or even to relax your zeal. If you cannot break the heart, truly it is no business of yours to do so; commit that work to Him who is fully equal to the miracle, keep to your work, and fear not that the Lord will work with you. God bids you continue prayer, warning instruction, and invitation. If you knew that every soul you preached to or talked with would be lost, it were no less your duty to preach the gospel; for the duty to tell out the gospel is not influenced by our success, but is based upon the commission of Christ: “Go ye into all the world, and preach the gospel to every creature.”