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Love was as subtly caught, as a disease; But being got it is a treasure sweet, which to defend is harder than to get: And ought not be profaned on either part, for though 'Tis got by chance, 'Tis kept by art.

John Donne (2013). “Delphi Complete Poetical Works of John Donne (Illustrated)”, p.115, Delphi Classics
Love was as subtly caught, as a disease; But being got it is a treasure sweet, which to defend is harder than to get: And ought not be profaned on either part, for though 'Tis got by chance, 'Tis kept by art.