An extremely difficult or involved problem. From a 16th century legend about a King Gordius tying an intricate knot and saying that whoever untied it would become the ruler of Asia. It was sliced with a sword by Alexander the Great.
Spiritually: Satan, Adam, and Eve created an extremely difficult and involved set of problems: Separation from God and something called Sin. It was sliced through with the Sword of the Spirit by Jesus the Great …Gordian knot.