What does Genesis 6:13 mean?

God begins revealing His plan to Noah. We can only assume it must have been devastating for Noah to hear. As a righteous, blameless man who walked with God (v. 9), Noah would likely have agreed that the earth was filled with violence because of the sinfulness of humanity. But could anything have prepared Him for God's announcement? We can't be entirely sure about how many relatives, including possibly other children, Noah had at this time. Regardless, the idea of the entire human world being killed would have been terrifying.

In plain language, God told Noah that He was getting ready to put an end to all of humanity because of their violence. He would destroy "all flesh," meaning both humanity and animals, along with the earth—or land—itself. In one blunt statement, God announces to Noah both His verdict and the sentence on humanity. God would exercise His right as creator and judge; He would hold His creatures responsible for their sinful choices. He alone had (and still has) both the right and the power to carry out such a plan.