What is Nihil Tarn Naturale Est, Quam Eo Genere Quidque Dissolvere, Quo Colligatum Est; Ideo Verborum Obligatio Verbis Tollitur; Nudi Consensus Obligatio Contrario Consensu Dissolvitur?

Legal Definition
Nothing is so natural as to dissolve anything in the way in which it was bound together; therefore the obligation of words is taken away by words; the obligation of mere consent is dissolved by the contrary consent Dig. 50, 17, 35; Broom, Max. 887.
-- Black's Law Dictionary