CHAPTER IThe Universal Need For Sales Knowledge Analysis of Secret of Certain Success The Secret of Certain Success has four principal elements. It comprises: (1) Knowing how to sell (2) The true idea (3) Of one's best capabilities (4) In the right market or field of service. Your success will be in direct proportion to your thorough knowledge and continual use of all four parts of the whole secret. No matter how great your effort, an... more...