Without doubt, the most common weakness of all human beings is the habit of leaving their minds open to the negative influence of other people.
Napoleon HillIf a man attains a high station in life, it is because he has acquired or was blessed with native ability as a salesman. Schooling, college degrees, intellect, brilliancy, are of no avail to the man who lacks the ability to attract the cooperative efforts of others, thus to create opportunities for himself.
Napoleon Hill