Beauty addresses itself ...

Beauty addresses itself chiefly to sight, but there is a beauty for the hearing too, as in certain combinations so words and in all kinds of music; for melodies and cadences are beautiful; and minds that lift themselves above the realm of sense to a higher order are aware of beauty in the conduct of life, in actions, in character, in the pursuits of the intellect; and there is the beauty of the virtues.
 Plotinus

Quotes from the same author

Knowledge has three degrees: opinion, science, illumination. The means or instrument of the first is sense; of the second, dialectic; of the third, intuition.
 Plotinus
Knowledge, if it does not determine action, is dead to us.
 Plotinus