Facilis descensus Averni:
noctes atque dies patet atri ianua Ditis;
sed revocare gradium 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.
--
Lines 126-129 (translated by John Dryden)
--
The journey down to the abyss Is prosperous and light: The palace gates of gloomy Dis Stand open day and night: But upward to retrace the way And pass into the light of day There comes the stress of labour.
--
Translated by John ConingtonVirgil
There are two styles of walls "opus reticulatum," now used by everybody and the ancient style called "opus incertum." Of these, the reticulatum looks better, but its construction makes it likely to crack... On the other hand, in the opus incertum, the rubble lying in courses and imbricated, makes a wall which though not beautiful, is stronger.
Vitruvius
Circumretit enim vis atque iniuria quemque,
atque, unde exortast, at eum plerumque revertit.Lucretius
Insanam uatem aspicies, quae rupe sub ima
fata canit foliisque notas et nomina mandat.
quaecumque in foliis descripsit carmina uirgo
digerit in numerum atque antro seclusa relinquit:
illa manent immota locis neque ab ordine cedunt.
uerum eadem, uerso tenuis cum cardine uentus
impulit et teneras turbauit ianua frondes,
numquam deinde cauo uolitantia prendere saxo
nec reuocare situs aut iungere carmina curat:
inconsulti abeunt sedemque odere Sibyllae.Virgil
Emas non quod opus est, sed quod necesse est. Quod non opus est, asse carum est.
Cato the Elder
People lie. Auras never lie.
Harbhajan Singh Yogi
Virgil
Virchow, Rudolf
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