You don't prove that you'll be a good prime minister by talking. We had a headmaster once who was an absolutely brilliant speaker, a quick thinker, very eloquent (it's how he got the job). He was the worst imaginable head, weak, arbitrary, flip-flopping, easily bullied by his senior staff, managed to get us duffed up by Ofsted...

Clever talk don't butter no parsnips, Bonzo. 'Tis by her fruits shalt thou knowest her (as for me personally, she can keep her fruits to herself).