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cf., Sent.I.D25.Ex, Sent.I.D34.Q1.A2
It is to be noted, first, that this question concerns our manner of naming, which follows upon our manner of cognition, since names are signs of intellectual concepts. Thus, we name God after the manner of created things rather than how He is in Himself.
In the english language, we use the preposition "of" (in Latin, this concerns the genitive case) refers to some cause in general, whereas other more particular prepositions can designate a particular species of causality, such as "out of" (material cause), "for the sake of" (final cause), or "from" (material or efficient cause). As St. Thomas states in another place,
> This preposition "from" denotes the bearing of an efficient or material cause, whereas in the genitive ["of"], the bearing of any cause whatsoever can be understood. (Sent.I.D25.Ex)