“If you have no confidence in self you are twice defeated in the race of life. With confidence you have won even before you have started”
is a quote from Marcus Garvey in his book the Philosophy and Opinions of Marcus Garvey. It is one of the most widely known quotes by him. It generates at least a 1000 results in a search on google books. It produces over 86,000 results on a verbatim search on google.