“Since knowledge is but sorrow's spy,
It is not safe to know.”

— William Davenant

The Just Italian (licensed Oct. 2, 1629; printed 1630), Act v. Sc. 1.
Compare: "From ignorance our comfort flows", Matthew Prior, To the Hon. Charles Montague; "Where ignorance is bliss, ’T is folly to be wise", Thomas Gray, Eton College, Stanza 10.

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William Davenant3

English poet and playwright 1606–1668

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