Reason, not appetite, should control the judgment. - Nicolas Poussin

To judge well is very difficult. To do so requires both theory and practice.

Virgil, above all others, has shown himself a great observer. So proficient is he that often, by the mere sound of words chosen, he actually puts before us the thing described. If he speaks of love, his words are so skillfully brought together that a sweet harmony results, whereas, when he sings of warlike deeds or describes a tempest, the verse hastens, and the resonant sounds admirably depict a scene of fury, tumult, and terror.

There are two ways of seeing things. One is simply looking at them, the other means considering them attentively. Only to see is nothing else but receiving into the eye the form or likeness of the object looked at, but to consider a thing is more than this; that is, to seek with special diligence after the means of knowing this object thoroughly.