John 5:30
30I can of myself do nothing. As I hear, I judge; and my judgment is righteous, because I don’t seek my own will, but the will of my Father who sent me.
The Son’s judgment is just because it is not self-willed. Wesley: it is impossible he should do anything separately from the Father. Hearers may trust this Judge; he is not an independent rival to the Father, nor a threat to sincere faith.
As in v. 19: one will, one judgment. The incarnate Son seeks the Sender’s will. Just judgment flows from that unity, not from consulting human courts.