It is an act of impiety for the flamen Dialis to remain for a single night without the city.

Do ye mean to make them Veientian instead of Roman priests?
And shall the virgins forsake thee, O Vesta?
And shall the flamen by living abroad draw on himself and on his country such a weight of guilt every night?
What of the other things, all of which we transact under auspices within the Pomaerium, to what oblivion, to what neglect do we consign them?
The assemblies of the Curias, which comprise military affairs; the assemblies of the Centuries, at which you elect consuls and military tribunes, when can they be held under auspices, unless where they are wont [to be held]?
Shall we transfer them to Veii?
or whether for the purpose of holding their elections shall the people assemble at so great inconvenience into a city deserted by gods and men?
53.

"But the case itself forces us to leave a city desolated by fire and ruin, and remove to Veii, where all things are entire, and not to distress the needy commons by building here.

But that this is only held out as a pretext, rather than that it is the real motive, I think is evident to you, though I should say nothing on the subject; for you remember that before the arrival of the Gauls, when the buildings, both public and private, were still unhurt, and the city still stood in safety, this same question was agitated, that we should remove to Veii.
Observe then, tribunes, what a difference there is between my way of thinking and yours.

Ye think that though it may not have been advisable to do it then, still that now it ought certainly to be done; I, on the contrary, (and be not surprised until you shall have heard the state of the case,) admitting it were advisable to remove when the entire city was safe, would not vote for relinquishing these ruins now.