Consider carefully what He said about the Ark:
But as the days of Noah were, so also will the coming of the Son of Man be. For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, and did not know until the flood came and took them all away, so also will the coming of the Son of Man be. (Matthew 24:37–39; cf. Luke 17:26–27)
When Noah (and his wife and three sons and their wives) entered the Ark, the rest of humanity “did not know” that a flood was coming that would “take them all away.” The Flood was worldwide and inescapable (Genesis 7:19–20; 1 Peter 3:20). They were totally distracted by the things of this world and died in the greatest catastrophe the world had ever known since the Curse of Genesis 3.
God was infinitely concerned about that unbelieving world. “The Divine longsuffering waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight souls, were saved through water” (1 Peter 3:20). And what was Noah doing? He most likely warned everyone of what was about to happen—and why. God “did not spare the ancient world, but saved Noah, one of eight people, a preacher of righteousness, bringing in the flood on the world of the ungodly” (2 Peter 2:5). I can picture Noah pleading with people to trust in the “longsuffering” Lord, and to believe His warnings, and to enter the only provision in the entire world for survival—the Ark.
It is not faith in what anyone might say, but what God has said!
What did Noah need to build the Ark and to move into it with his family? “By faith Noah, being divinely warned of things not yet seen [such as a global deluge of water], moved with godly fear, prepared an ark for the saving of his household, by which he condemned the world and became heir of the righteousness which is according to faith” (Hebrews 11:7). What is faith? It is “the substance of things hoped for, the evidence of things not seen” (Hebrews 11:1). It is not faith in what anyone might say, but what God has said!
Today, we have an infinitely greater Ark—the Lord Jesus Christ! He said, “I am the door. If anyone enters by me, he will be saved” (John 10:9). Friend, do you know Him as your Savior? Trust Him today.