In his books, he asserted a revisionist thesis: Spanish Jews converted to Christianity willingly, not under duress.
According to the transcriber, Kerry “asserted that [Qatar's prime minister] was preaching to the converted.”
Part of the answer is effective storytelling and media training, asserted author and human-rights activist Marylouise Oates.
c.1600, "declare," from Latin assertus, past participle of asserere "claim, maintain, affirm" (see assertion). Related: Asserted; asserting. To assert oneself "stand up for one's rights" is recorded from 1879.