And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. – Acts 16:31

In a great many, unbelief may be ascribed to a careless ignorance of the way of salvation. Now, I should not wonder if many of you imagine that if you do not understand the Gospel, you are therefore quite excused for not believing it. But, sirs, it is not so. There are places of worship all around you, which you can without difficulty attend. The Book of God is very cheap. You have it in your houses. You can all read it or hear it read.

Is it so, then, that the King has been pleased to reveal Himself to you, and tell you the way to salvation, and yet you, at the age of twenty, thirty, or forty do not know the way of salvation? What do you mean, sir? What can you mean? Has God been pleased to reveal Himself in Scripture, and tell you how to escape from hell and fly to heaven, and yet have you been too idle to inquire into that way? Dare you say to God, “I do not think it worth my while to learn what You have revealed, neither do I care to know of the gift which You have bestowed on men.”

How can you think that such ignorance is an excuse for your sin? What could be a more gross aggravation of it? If you do not know, you ought to know. If you have not learned the Gospel message, you might have learned it, for there are some of us whose language it is not difficult for even the most illiterate to understand, and who would, if we caught ourselves using a hard word, retract it, and put it into little syllables, so that not even a child’s intellect need be perplexed by our language. Salvation’s way is plain in the Book. Those words, “Believe and live,” are in this Christian England almost as legible and as universally to be seen as though they were printed on the sky. That trust in the Lord Jesus saves the soul is well-known news. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1012.cfm