A Defence of Poetry and Other Essays
What does Shelley say about duty and virtue?
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From the text:
Duty is obligation. There can be no obligation without an obliger. Virtue is a law, to which it is the will of the lawgiver that we should conform; which will we should in no manner be bound to obey, unless some dreadful punishment were attached to disobedience. This is the philosophy of slavery and superstition.
A Defence of Poetry and Other Essays