…and how shall they hear without a preacher? – Romans 10:14
Someone must make the truth known to men. They will not find out about the Savior unless they are told of Him. The Gospel will not be revealed to men by any supernatural agency—we must go with it. They cannot learn it without being taught it. No man will know the Gospel unless somebody tells it to him, by word of mouth, or by the gift of a book or a tract, or by a letter, or by the open preaching of the Word. Somebody must make it known to the man, for how can he believe in Him of whom he has not heard, and how can he hear without a preacher?
Who ought to preach, then? Everyone who can preach, should do so. The gift of preaching is the responsibility for preaching. I often wonder at some Christian men who can fire away so grandly on the platform, but who never speak for Christ—they will have to account for those prostituted tongues. If a man can speak upon the temperance question, he can speak upon the salvation question; let him take care that he does so…Every man who knows the Gospel ought to make it known. “Let him that heareth say, Come.” When you hear the Gospel, tell it to somebody else—you Christian people are all bound, in proportion to your gifts and your opportunity, to make the Gospel known.
“Why!” says one, “I thought that work was for priests.” Just so, it is only for priests. But then all believers are priests. By His mighty grace, our Lord Jesus Christ has made us kings and priests unto God; and it is our duty, as well as our privilege, to exercise this blessed priestly function of telling to the sons of men the way whereby they may be saved. Each man, then, who knows Christ, and each woman and each young person, too, are bound to tell of Christ in some way or other to all who are round about them. ~ C.H. Spurgeon
https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2327.cfm