The noblest pleasure is the joy of understanding.
All our knowledge has its origins in our perceptions.
There is no result in nature without a cause; understand the cause and you will have no need of the experiment.
The eye, the window of the soul, is the chief means whereby the understanding can most fully and abundantly appreciate the infinite works of Nature; and the ear is second.
Experience never misleads; what you are misled by is only your judgment, and this misleads you by anticipating results from experience of a kind that is not produced by your experiments.
You do ill if you praise, but worse if you censure, what you do not understand.
Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.
Although the poet has as wide a choice of subjects as the painter, his creations fail to afford as much satisfaction to mankind as do paintings... if the poet serves the understanding by way of the ear, the painter does so by the eye, which is the nobler sense.
It is ill to praise, and worse to blame, the thing which you do not understand.
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