If you want motivational quotations and stories, the best I have seen is Bob Proctor's "Insight of the Day."
It is good that you are reading up on how to sell.
It would be far better if you learned an effective, linear sales process that does not require memorization, which you could customize to your company's products and services.
A sales process is like a set of carpenter's tools. An unmatched set with many missing tools may enable you to get the job done, but very slowly and not very well.
A good quality matched set, in all sizes, enables you to select the right tools for each job and it does not take long to learn how to use them effecively.