Thou hast pleaded, etc. The reference is still to a former state of things which came to an end. It would make this plainer if we were to alter the rendering, Thou didst plead … thou didst redeem. The speaker likens his case to that of a poor man who is opposed at law by a rich oppressor, and who, for want of an advocate, will, to all appearance, become his victim.
Suddenly Jehovah appeared and supplied this want. Such are God's "wonders of old time."