'Secret' in the Bible

Then Pharaoh also called for the wise men and sorcerers, and they along with the Egyptian magicians did the same thing with their secret arts.

But the Egyptian magicians did the same thing with their secret arts. Pharaoh's heart was stubborn, and he did not listen to them, just as the LORD had said.

But the magicians did the same thing with their secret arts, and they brought up frogs on the land of Egypt.

The magicians tried to do the same thing with their secret arts, but they were unable to bring out the gnats. The gnats were on the people and the animals.