It is richt facil and eith gait, I the tell,
Forto discend and pas on down to hell:
The blak gettis of Pluto, and that dirk way,
Standis evir oppin and patent nycht and day;
Bot tharfra to return agane on hyght,
And heir abufe recovir this aris licht,
That is difficil wark, thar lawbour lyis.
Bk. 6, line 265. - Eneados