i.m. Omar Khayyám (or, 'Clause 56')

d. 4.10.1131

For "Is" and "Is-not" though with Rule and Line
And "Up" and "Down" by Logic I define,
Of all that one should care to fathom,
Was never deep in anything but--Wine.

- The Rubaiyat, transl. Edward FitzGerald

[with thanks to AC, for the tip-off]