Self - described ` ` Undisputed Master of Motivation '' was known for his seminars . He wrote more than two dozen books on salesmanship and marketing . ` ` Failure is a failure , not a dead - end , '' is one of many famous stock quotes .
Self-described `` Undisputed King of Motivation '' was known for his seminars . He wrote more than two dozen books on salesmanship and motivation . `` Failure is a detour , not a dead-end street '' is one of many famous Ziglar quotes .