Just as Jesus had warned His disciples not to be deceived by false Christs because His second coming would be visible to everyone, He also explains that until the very day of His coming, the world will continue on its present course. People will not discern the signs of His coming just as the people during Noah's day didn't realize their impending judgment. This corresponds exactly with Jesus' prophecies about His coming being like the appearance of a thief in the night. Jesus is emphasizing that the unbelievers will not recognize that He is coming until it is too late. He is stressing that His coming will take the world by surprise.