An intelligent man in the sphere most stimulating to his faculties can see in every direction, like a snail; he has the keen scent of a dog, the ears of a mole; he can hear, and feel, and see all that is going on around him.
 Honoré de Balzac, Lost Illusions (1843). copy citation

add
Author Honoré de Balzac
Source Lost Illusions
Topic snail ears
Date 1843
Language English
Reference
Note Translated by Ellen Marriage
Weblink https://www.gutenberg.org/cache/epub/13159/pg13159.html

Context

“there should be an intimate alliance between the reader and his audience, or swift and subtle communication of the poet's thought and feeling becomes impossible. Here this close sympathy was lacking, and Lucien in consequence was in the position of an angel who should endeavor to sing of heaven amid the chucklings of hell. An intelligent man in the sphere most stimulating to his faculties can see in every direction, like a snail; he has the keen scent of a dog, the ears of a mole; he can hear, and feel, and see all that is going on around him. A musician or a poet knows at once whether his audience is listening in admiration or fails to follow him, and feels it as the plant that revives or droops under favorable or unfavorable conditions.” source