And that none might think that He limited His Father’s power, He said not, “If thou canst do it,” but “If it may be,” or, “If it be possible;” as much as to say, If thou wilt. For whatever God wills can be done, as Luke expresses more plainly; for he says not, “If it be possible,” but “If thou wilt.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Cons. Ev., iii, 4