I just looked up the notes to perek Aleph Tanya- where The Rebbe notes. It’sa bit different than what I wrote so here it is:
“When a Jew acts in a benevolent manner, he is motivated mainly out of concern for the welfare of his fellow. The proof of this is that were his fellow not to need his help, this would give him greater pleasure than the gratification derived from his act of kindness.
Concerning the nations of the world, however, this is not so. Their motivation is not the welfare of their fellow; rather, it stems from a self-serving motive—the desire for self-glorification, a feeling of gratification, and the like.
It should be noted that among the nations of the world, there are also to be found those whose souls are derived from kelipat nogah.33 Called “the pious ones of the nations of the world,” these righteous individuals are benevolent not out of selfish motives but out of a genuine concern for their fellow.”