(α) They can never be taught without natural gifts to receive them.
(β) They can always be greatly improved in those who possess these gifts.
(γ) They must not be paraded, or they cease to be arts in the higher sense, for
(δ) The highest art is to attain perfect nature.
So also—
(1) No teaching by mere specimens and by memory is possible ([§ 5]).
(2) All the general rules are obvious, and yet
(3) Natural gifts are necessary to apply them with skill.
I. The Manner of Conversation, or
Subjective Conditions,