In each human heart terror survives
The ravin it has gorged: the loftiest fear
All that they would disdain to think were true:
Hypocrisy and custom make their minds
The fanes of many a worship, now outworn.
They dare not devise good for man's estate,
And yet they know not that they do not dare.
Fury, Act I, l. 618–624. - Prometheus Unbound (1818–1819; publ. 1820)