A few quotes from the Rabbi on 'Israel and the Nations'
in which he teaches that Gentile morality is a prelude to holiness.
Basic morals are universal, and termed "the ways of the land" in Aramaic, referring to the type of natural human behavior that enables life in human society, as simple as it sounds. I must begin by acknowledging that I have been created and that I have been granted my existence by the Creator…
I must also acknowledge that the other is a creation of the same Creator as well and that we both share a task, which is to solve the equation of brotherhood, through mutual respect between two individuals that are of equal value, without transforming the other into an object or imposing a master-slave relation on him…
There is morality among non-Jews, principally among the Righteous of the Nations who understood the importance of adopting and cultivating those values that are, in a sense, the prelude to sanctity. The Righteous of the Nations have the sincere intention to construct a human society in which the other is protected and can live.
Sod Midrash Hatoladot A, Malcei Tzedek, pp. 199-200, Dudu Press, Kiryat Arba (or Hava Press, Beit El) 2009