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Short note; virtue and karma are translations of the chinese concepts de and ye. 
Virtue is mentioned in the Taoist classic Dao De Jing, "The Path and its Virtue". Can also be romanized as Te.

https://en.wikipedia.org/wiki/The_Te_of_Piglet

Ye is talked of in Zhuan Falun, but is translated as Karma in the western editions. They're to be treated as opposing concepts.