Facilis descensus Averni:
noctes atque dies patet atri ianua Ditis;
sed revocare gradum superasque evadere ad auras.
hoc opus, hic labor est.
The gates of hell are open night and day;
Smooth the descent, and easy is the way:
But to return, and view the cheerful skies,
In this the task and mighty labor lies.