Matthew 24:39 Meaning: They Didn't Know Until the Flood Came

Two Greek words matter here. The first is egnōsan, the word for 'they knew'. It comes from ginōskō, which means to truly understand or perceive, not just to have facts. The people of Noah's day had plenty of facts. They saw the ark taking shape year after year. They heard Noah's warnings. But the knowledge never sank into their bones. They did not know in the deep way that changes how you live.

The other key word is parousia, translated 'coming'. In the Roman world, this word described the official visit of a king or emperor. It was a public, unmistakable event. Jesus uses this royal term for His own return. The coming of the Son of Man will not be secret or hidden. It will be as visible as the flood rising around the ark. The warning of this verse is not about guessing dates. It is about letting the truth we already know change us while there is still time.

Christians across traditions have read this verse as a serious call to readiness. Methodist commentator Adam Clarke says the people simply did not lay Noah's warning to heart. Reformed theologian John Calvin points deeper: unbelief had blinded their minds, while Noah saw by faith. Baptist scholar John Gill notes that they had notice but refused to know, and God gave them over to a hardened heart. Many also see a parallel to the destruction of Jerusalem in AD 70, which came suddenly upon an unwary generation. All agree that the verse warns against being so absorbed in daily life that we miss the reality of Christ's return. The differences lie in how much emphasis is placed on human choice versus divine sovereignty, but the call to watchfulness remains the same.

Some readers think 'they didn't know' means the flood came without any warning at all. In fact, Noah preached righteousness for over a century and built an enormous ark in plain sight. The people had all the warning they needed. They 'didn't know' because they refused to listen. The mistake is to think ignorance is the problem. The real problem is knowing but not caring.

This week, you will do ordinary things: eat meals, talk with family, go to work. None of that is wrong. The people in Noah's day were doing nothing evil by eating and marrying. The danger was that those good things filled their whole view. They had no room left for warning. So here is something concrete: each morning this week, before you check your phone or start your list, pause and say quietly, 'Jesus is coming. I want to be ready for Him.' That small pause can reset your focus. It helps you hold the ordinary things in one hand and the eternal reality in the other.