Jamieson, Fausset and Brown on John 5:21-23

21-23. raiseth the dead and quickeneth them--one act in two stages. This is His absolute prerogative as God.

so the Son quickeneth them--that is, raiseth up and quickeneth.

whom he will--not only doing the same divine act, but doing it as the result of His own will, even as the Father does it. This statement is of immense importance in relation to the miracles of Christ, distinguishing them from similar miracles of prophets and apostles, who as human instruments were employed to perform super-natural actions, while Christ did all as the Father's commissioned Servant indeed, but in the exercise of His own absolute right of action.