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"Aristotle tacitly accepts that the moods of the first figure are perfect and need not be proved."
Jan Lukasiewicz, Aristotle's Syllogistic from the Standpoint of Modern Formal Logic, 1957, p. 182 [Barbara: AAA].

Evelyn Stein — Quiet Resource
https://www.youtube.com/watch?v=G_BrbhRrP6g

"Just this terrible pain that wounds me to the quick — when one man attempts to plunder a man his equal,
to commandeer a prize, exulting so in his own power. That's the pain that wounds me, suffering such humiliation."
Homer, Iliad, Book 16, lines 60-64 [Achilles to Patrocles].

"Aristotle accepts as perfect syllogisms the moods of the first figure, called Barbara, Celarent, Darii, and Ferio. 
Yet in the last chapter of his systematic exposition he reduces the third and fourth moods to the first two, and 
takes therefore as axioms of his theory the most clearly evident syllogisms, Barbara and Celarent. This detail 
is of no little interest." 
Jan Lukasiewicz, Aristotle's Syllogistic..., p. 41 [Posterior Analytics, 72b18: not all knowledge is demonstrable.]