16. And the Lord shut him in. This is not added in vain, nor ought it to be lightly passed over. That door must have been large, which could admit an elephant. And truly, no pitch would be sufficiently firm and tenacious, and no joining sufficiently solid, to prevent the immense force of the water from penetrating through its many seams, especially in an irruption so violent, and in a shock so severe. Therefore, Moses, to cut off occasion for the vain speculations which our own curiosity would suggest, declares in one word, that the ark was made secure from the deluge, not by human artifice, but by divine miracle. It is, indeed, not to be doubted that Noah had been endued with new ability and sagacity, that nothing might be defective in the structure of the ark. But lest even this favor should be without success, it was necessary for something greater to be added. Wherefore, that we might not measure the mode of preserving the ark by the capacity of our own judgment, Moses teaches use that the waters were not restrained from breaking in upon the ark, by pitch or bitumen only, but rather by the secret power of God, and by the interposition of his hand.