Hindrance to the perceptions of sense is an evil to the animal nature.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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Author Marcus Aurelius
Source Meditations
Topic perception evil
Date c. 170 - 180
Language English
Reference
Note Translated by George Long
Weblink https://www.gutenberg.org/files/15877/15877-h/15877-h.htm

Context

“If thou takest away thy opinion about that which appears to give thee pain, thou thyself standest in perfect security.—Who is this self?—The reason.—But I am not reason.—Be it so. Let then the reason itself not trouble itself. But if any other part of thee suffers, let it have its own opinion about itself (vii. 16) . 41. Hindrance to the perceptions of sense is an evil to the animal nature. Hindrance to the movements [desires] is equally an evil to the animal nature. And something else also is equally an impediment and an evil to the constitution of plants. So then that which is a hindrance to the intelligence is an evil to the intelligent nature.” source