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Love why do we one passion call, When 'tis a compound of them all? Where hot and cold, where sharp and sweet, In all their equipages meet; Where pleasures mix'd with pains appear, Sorrow with joy, and hope with fear.

Jonathan Swift (1843). “Works: Containing Interesting and Valuable Papers Not Hitherto Published”, p.681
Love why do we one passion call, When 'tis a compound of them all? Where hot and cold, where sharp and sweet, In all their equipages meet; Where pleasures mix'd with pains appear, Sorrow with joy, and hope with fear.