Tanya: And this is (p. 483) ...will have rest... (p. 485).
Chassidic doctrine demands that before reproving another, one must pare his own "fingernails," in order not to gash the other. "They (the forces of evil) seize by the fingernails"; every stab is k'lipa and sitra achra. After the "nails" are pared there must be "laving the hands," as explained in Chassidus1 - calling forth intellect into emotion.2
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