"Universal Self" in the Gita

The principle behind the Golden rule "treat others as you would like to be treated," is stated in the Gita as " He sees the Self in all beings, and all beings in the Self, everywhere he sees the same."

And

"He who looks on all as his own self, perceiving the delight and suffering of others as his own is deemed the highest of all."

This is the law of the universal self, which serves as the principle from which the "Golden rule" is derived.