For pleasure is called in Scripture a serpent, which by nature is such that if its head has reached a wall so as to press upon it, it drags its whole body after it. So nature has given man the habitation which was necessary for him. But by means of this necessity, pleasure assaults the heart, and perverts it to the indulgence of immoderate ornament; in addition to this it brings in its train covetousness, which is followed by lust, that is, the last member or tail of the beast. But as it is not possible to draw back the serpent by its tail, so to remove pleasure we must not begin with the last, unless one has closed the first entrance to evil.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. in Cant.