13 On the very same day Noah and Shem and Ham and Japheth, the sons of Noah, and Noah’s wife and the three wives of his sons with them, entered the ark, 14 they and every beast after its kind, and all the cattle after their kind, and every creeping thing that creeps on the earth after its kind, and every bird after its kind, all sorts of birds. 15 So they went into the ark to Noah, by twos of all flesh in which was the breath of life. 16 Those that entered, male and female of all flesh, entered as God had commanded him; and the LORD closed it behind him.
17 Then the flood came upon the earth for forty days, and the water increased and lifted up the ark, so that it rose above the earth. 18 The water prevailed and increased greatly upon the earth, and the ark floated on the surface of the water. 19 The water prevailed more and more upon the earth, so that all the high mountains everywhere under the heavens were covered. 20 The water prevailed fifteen cubits higher, and the mountains were covered. 21 All flesh that moved on the earth perished, birds and cattle and beasts and every swarming thing that swarms upon the earth, and all mankind; 22 of all that was on the dry land, all in whose nostrils was the breath of the spirit of life, died. 23 Thus He blotted out every living thing that was upon the face of the land, from man to animals to creeping things and to birds of the sky, and they were blotted out from the earth; and only Noah was left, together with those that were with him in the ark. 24 The water prevailed upon the earth one hundred and fifty days.
When God does something, He does it right, and He does it completely. The floodwaters rose to cover the mountains, and then they rose another fifteen cubits. While it isn’t particularly exciting to think about God destroying all flesh from the earth, it does teach us that He can be depended on. When God says He will do something, there need be no doubt. He will do it, and not just halfway. As Paul said, “He who began a good work in you, will be faithful to complete it.”