It goes almost without saying that your inherent intelligence must be expanded to the fullest degree in order to gain and hold the respect and admiration of your associates. One must avoid evidences of carelessness and superficial thinking, and repace them with sincerity and confident knowledge. You must not only have a thorough knowledge of your product and service, but a complete understanding of your business and its many ramifications. As Lowell wrote: "In the scale of the destinies, brawn will never weight so much as brain".
Intelligence is built brick by brick on the facade of the human mind, and it expands in proportion to its building. In the word of Longfellow: "The intellect of man sits enthroned visibly upon his forehead and in his eye, and the heart of man is written on his countenance, but the soul reveals itself in the voice only." In other words, keep a good head on your shoulders and it will show in your personality!