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Before thou reprehend another, take heed thou art not culpable in what thou goest about to reprehend. He that cleanses a blot with blotted fingers makes a greater blur.

Francis Quarles (1844). “Enchiridion Institutions, Essays and Maxims, political, moral & divine. Divided into four centuries. By Francis Quarles”, p.58
Before thou reprehend another, take heed thou art not culpable in what thou goest about to reprehend. He that cleanses a blot with blotted fingers makes a greater blur.