Nature never wears a mean appearance. Neither does the wisest man extort her secret, and lose his curiosity by finding out all her perfection.
 Ralph Waldo Emerson, Nature (1836). copy citation

Context

“But every night come out these envoys of beauty, and light the universe with their admonishing smile. The stars awaken a certain reverence, because though always present, they are inaccessible; but all natural objects make a kindred ​impression, when the mind is open to their influence. Nature never wears a mean appearance. Neither does the wisest man extort her secret, and lose his curiosity by finding out all her perfection. Nature never became a toy to a wise spirit. The flowers, the animals, the mountains, reflected the wisdom of his best hour, as much as they had delighted the simplicity of his childhood. When we speak of nature in this manner, we have a distinct but most poetical sense in the mind.” source