The virtue of the imagination is its reaching, by intuition and intensity, a more essential truth than is seen at the surface of things.
No one can explain how the notes of a Mozart melody, or the folds of a piece of Titian's drapery, produce their essential effects. If you do not feel it, no one can by reasoning make you feel it.
All you have really to do is to keep your back as straight as you can; and not think about what is upon it. The real and essential meaning of "virtue" is that straightness of back.
Imperfection is in some sort essential to all that we know in life.