If any speak ill of thee, flee home to thy own conscience, and examine thy heart: if thou be guilty, it is a just correction; if not guilty, it is a fair instruction: make use of both; so shalt thou distil honey out of gall, and out of an open enemy create a secret friend.

Enchiridion Institutions, Essays and Maxims, political, moral & divine. Divided into four centuries. By Francis Quarles (ed. 1844)