“And the LORD said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.
And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days:”
Exodus 10:21-22 KJV
The power is in gods word the creators word
“And God said, Let there be light: and there was light.”
Genesis 1:3
The greatest faith jesus encountered in all Israel understood his word is the power
“And Jesus saith unto him, I will come and heal him. The centurion answered and said, Lord, I am not worthy that thou shouldest come under my roof: but speak the word only, and my servant shall be healed.
For I am a man under authority, having soldiers under me: and I say to this man, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it.
When Jesus heard it, he marvelled, and said to them that followed, Verily I say unto you, I have not found so great faith, no, not in Israel. And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven.
But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth.”
Matthew 8:7-12 KJV
The centurion understood gods word is what determines things if he speaks it it cannot fail if we speak it independent of his Will and word it will fail always