Confucius on the Book of Odes:

“The Three Hundred Songs may be summed up in one phrase: ‘No evil thoughts.’ ” (Analects II: 2)

"It is by the Odes that the mind is aroused; it is by the rules of propriety that the character is established; it is from Music that the finish is received."

(or "Be inspired by the Songs, confirmed by ritual, and perfected by music." (Analects VIII: 8)

"Little ones, why does none of you study the Odes? The Odes may be used for stimulation [stimulating the mind], for [self-]contemplation, and for sociability. Through them you are able to express your grievances. At home, they can be used to serve your parents and, abroad, to serve your ruler. Through them you may gain broad acquaintance with the names of birds and animals, plants and trees." (Analects XVII: 9)

“If you do not study the Songs, you will not be able to speak (properly).” (Analects XVI: 13)

"The Guan Ju is expressive of enjoyment without being licentious, and of grief without being hurtfully excessive." (Analects, III: 20)