Isidore of Seville, Etymologies 1.1:
Instruction (disciplina) received its name from learning (discendo): for this reason, it can also be called knowledge (scientia), because to know (scire) is derived from to learn (discere), because no one knows something if they have not learned it. Alternatively, it is called disciplina because it is learned in its fullness (disciturplena). Art however is so called because it consists of strict (artis) precepts and rules. Others say that this word is derived from the Greeks, from arete, that is, from virtue, which they called knowledge.
Plato and Aristotle wanted to establish this difference between art and instruction, saying that art (ars) consists of those things which can come about in an alternative way; but instruction (disciplina) deals with those things which cannot be otherwise than they are. For when something is discussed in true disputations…
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