Ready or Not Here I Come

Ready or not, here I come! The coming of the Lord Jesus Christ is going to be unexpected and come swiftly without warning. Jesus in his Olivet Discourse gives some more details about His coming. In the verses to follow in vs 36-44 in Matthew 24 our Lord gives two examples of His coming. First he reminds us of how the judgement of God came upon those who perished by the flood, and also gives us another parable about the the thief that comes when the master of the house didn't know about it. What do we learn from these examples that helps us understand about His second coming?