You ought to love all mankind; nay, every individual of mankind. You ought not to love the individuals of your domestic circles less, but to love those who exist beyond it more. Once make the feelings of confidence and of affection universal, and the distinctions of property and power will vanish; nor are they to be abolished without substituting something equivalent in mischief to them, until all mankind shall acknowledge an entire community of rights.
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Essay on Christianity (1859), Unfinished essay (c. 1815), first published in Shelley Memorials: From Authentic Sources (1859) edited by Lady Jane Gibson Shelley; also in The Works of Shelley in Verse and Prose (1880) , edited by H. Buxton Forman. Full essay online