'Uz, Hul, Gether and Mash,' as in Genesis 10:23, signify several kinds of knowledges derived from the knowledges of good, and anything pertaining those knowledges. Knowledges derived from the knowledges of good are natural truths, and anything pertaining to knowledges are actions based on them.

(Odkazy: Arcana Coelestia 1234)

1251. Verse 31 These were the sons of Shem, according to their families, according to their tongues, in their lands, according to their nations.

'These were the sons of Shem' means derivatives of the internal worship meant by 'Shem'. 'According to their families, according to their tongues, in their lands, in their nations' means according to the disposition of each of them in particular and in general - 'according to their families' is according to differences as regards charity, 'according to their tongues' is according to differences as regards faith, 'in their lands' is in general in relation to matters of faith, 'in their nations' is in general in relation to matters of charity.