Was this it?
*** w72 10/1 p. 588 pars. 2-3 Facing Up to Questions of Conscience ***
2 Paul said of the non-Israelite nations, those that were never under the Law covenant: “For whenever people of the nations that do not have law do by nature the things of the law, these people, although not having law [that is, a law code from God], are a law to themselves.” In what way? In that “they are the very ones who demonstrate the matter of the law to be written in their hearts, while their conscience is bearing witness with them and, between their own thoughts, they are being accused or even excused.” (Rom. 2:12-16) So this “law” that they are “to themselves” is not a law that they themselves make for themselves regardless of what others think.
3 This moral nature, inherited from God’s first human son, operates as a “law” or rule of conduct in people of all races and nationalities, now as in the past. This explains why the national or tribal laws of virtually all people have reflected at least some of God’s righteous standards, even though these peoples were without the Bible as their guide. It explains why individuals, though not true servants of Jehovah God or even professed Christians, may live generally “decent” lives, often manifesting adherence to certain good principles. At the same time it explains why God could justly hold not only his covenant people of Israel but the whole world of mankind ‘liable for punishment,’ and why, in the coming expression of his judgment, he can justly “render to each one according to his works.”—Rom. 2:6; 3:9, 19.