Final answer:
Patrick Henry's speaking power indeed lay in his ability to blend moral appeals with directness, as evidenced by his famous 'Give me Liberty, or give me Death!' speech, making the statement true.
Step-by-step explanation:
The statement that Patrick Henry's power as a speaker came from a combination of moral appeals with a blunt directness is true. Patrick Henry was renowned for his oratory skills, which were marked by his direct language and stirring moral appeals, as exemplified in his famous "Give me Liberty, or give me Death!" speech. This speech, delivered in March 1775, before the Virginia House of Burgesses, was a defining moment in American revolutionary rhetoric. Henry's impassioned words encapsulated the sentiments of those in favor of liberty at any cost and showcased his ability to mobilize support through his powerful and direct appeal to moral principles.