God's creative ability was manifested by His commanding word prefaced by 'there be.' In the book of Genesis, it is written that God created the heavens and the earth by speaking them into existence. For example, when God created light, He said, "Let there be light," and there was light. Similarly, when He created the sky, He said, "Let there be a vault between the waters to separate water from water," and it was so. This shows that God's creative power is so great that He can bring things into existence simply by speaking them into being. The phrase "let there be" is a clear expression of God's creative authority and His ability to make something out of nothing.