Sentence:  At any rate , the substance of Eichmann 's testimony was that all his actions flowed from his membership in the party and the SS , and though the Prosecutor did his utmost to <WSD>prove</WSD> actual personal hatred of Jews , his success on this score was doubtful and the anti-Semitic lesson weakened to that extent . 
Meaning of the word marked with <WSD> tags:  provide evidence for