Genesis 6:11-13 Now the earth was corrupt in God's sight and was full of violence. God saw how corrupt the earth had become, for all the people on earth had corrupted their ways. So God said to Noah, "I am going to put an end to all people, for the earth is filled with violence because of them. I am surely going to destroy both them and the earth.
So God has mentioned a few times in the last eight verses about how upset He is that man is so corrupt and evil and full of violence. When I hear someone complain once about something, I know they're thinking about it. But when I hear them complain about something more than once, I know they're really upset about it. Can you imagine how God feels when He complains about something more than once?
Let's consider Noah for a moment - Noah knows he does his best to please God. Trying to live his life right, raising a Godly family, loving his neighbors and all the ten commandments. And yet, we know from Bible history and our own lives that sometimes bad things happen to good people. I wonder if Noah thought for a moment that he would be included in the world being destroyed. At this point, God has not said, "except you Noah" - He is still just reiterating how upset He is with mankind. He tells Noah twice that He's getting ready to end all people and Noah doesn't say a word.
How many times in Bible history have we seen God start to lay out punishment and the person immediately begins to beg or excuse or defend themselves before God. I think Noah knew that even in our best efforts - we are never worthy to come before God. Whatever God's plan was, Noah was confident that his God of promises would protect him - whether it be here on earth or with Him. Are we willing to accept whatever God has in store - and rest on His promise?