John Lightfoot on John 5:19

[The Son can do nothing of himself.] That is, "The Messiah can do nothing of himself." For he is a servant, and sent by his Father; so that he must work, not of his own will and pleasure, but his Father's, Isaiah 42:1, "Behold my servant": Targum, Behold my servant the Messiah. So Kimchi in loc. and St. Paul, Philippians 2:7.

The Jew himself, however he may endeavour to elude the sense of that phrase 'the Son of God,' yet cannot deny the truth of this maxim, 'That the Messiah can do nothing, but according to the will and prescription of his Father that sent him.' Which he also will expound, not of the weakness and impotency, but the perfection and obedience, of the Son that he so doeth.