For whosoever shall call upon the name of the Lord shall be saved. – Romans 10:13

What an easy word we have here! “Whosoever shall call upon the name of the Lord.” Anybody can call upon the name of the Lord. Everybody understands what it is to call, “Hi, there!” Have you not often used such a call as that? And if you have been in distress or danger, have you never called, “Help, help, help?”

Very well, he who can thus call, let him call upon God, invoke His help, clamor for His mercy, crave His pity. If he does that in a believing way—as we shall have to show you, trusting that God will hear him—he shall be saved. So, there is no difficulty here that wants a Doctor of Divinity to explain—the truth is put mainly in monosyllabic words—”Whosoever shall call upon the name of the Lord shall be saved.” It is as plain as a pikestaff. Oh, that you might see it, and begin to call upon the name of the Lord by earnest prayer!

But here is a sure word—”Whosoever shall call upon the name of the Lord shall be saved.” There is no “if” here; no “maybe” here; but a glorious “shall.” Our shalls and wills are poor, puny things; but God’s “shall” is firm as the eternal mountains. “Whosoever shall call upon the name of the Lord shall be saved,” as surely as there is a God.

The Lord has made no mistake; He will not revoke His declaration by changing His mind. “Whosoever shall call upon the name of the Lord shall be saved.” Oh, that many would call upon His name and find immediate salvation, which will last them throughout life, and throughout eternity, for “shall be saved” reaches a very long way, even throughout the eternal ages that are yet to come. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2327.cfm