This comes to mind from Lucretius book V: 1198-1203 ish:
It is no piety to show oneself
Bowing with veiled head towards a stone,
Nor to be seen frequenting every altar,
Nor to fall prostrate on the ground, with palms outspread 1200
Before the shrines of gods, nor deluge altars
With streams of blood from beasts, vow piled on vow.
True piety is for a man to have the power
To contemplate the world with quiet mind.