Since, then, Christ has two natures, we hold that He has also two natural wills and two natural energies. But since His two natures have one subsistence, we hold that it is one and the same person who wills and energises naturally in both natures, of which, and in which, and also which is Christ our Lord: and moreover that He wills and energises without separation but as a united whole. For He wills and energises in either form in close communion with the other Leo, Epist. 10, ad Flavian.. For things that have the same essence have also the same will and energy, while things that are different in essence are different in will and energy Max., Disp. cum Pyrrho.; and vice versa, things that have the same will and energy have the same essence, while things that are different in will and energy are different in essence.