It cannot be refuted. It is not subject to changes in the tangible world precisely because it exists outside the tangible. It is spirit, this simple maxim of law, and and it is true self-evidently so. Truth in the spiritual world never changes. Maxims teach us unchanging truths and guide us in wisdom.
Truth is truth.
Nothing else is. That which is true spirit is always true. It is upon this fundamental truth that maxims of law are erected, principles of justice and truth that never change. They were true before you or I were born. They will be true then the sun stops shining and the oceans freeze solid.