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The person who knows how to express himself/herself his/her knowledge in an easy and convincing way is a more successful person because if a person don't know how use his knowledge in a proper way then what is the use of his knowledge. It is same like a fruit seller who have got a good variety of fresh fruits in his shop but without knowing how to sell them all. after some time all the freshness of the fruits will go and will get damaged and he will suffer a great loss.
Well, for me the person who have enough knowledge. knows too how to speak. because he has got all the materail what he need to speak/tell about. interrelated they are both. and if a good speaker doesnt have material he wont be able to speak.
It all depends on the job requirement. If the requirement is in reearch or technical what matters foremeost is his knowledge and skill while for a marketing job, the ability to put himself across convincingly is what matters. Ideally a combination of knowledge, ability to present himself and has convincing power, then he is a sure shot winner anywhere.