21 In addition to the distinction of natures in Christ, there is clearly shown here the distinction of the properties and activities, which arise from his double nature, 'Since the properties of each nature remain intact, and they are joined together in one person, majesty accepts lowliness, strength accepts weakness and the Eternal becomes mortal' ( Ep . xxviii, 3. PL . liv, 763. cf. St. Leo, Serm . xxi, 2. PL . liv, 192). And again: 'Each nature possesses its properties without defect' ( Ep . xxvii, 3. PL . liv, 768. cf. Serm . xxiii, 2. PL . liv, 201).
Source: Sempiternus Rex Christus (Vatican.va)