The American philosopher Henry D. Thoreau in the nineteenth century said that "the mass of men lead lives of quiet desperation." This means that most of us lack the courage to live the life we dream about. To have the courage to pursue our dreams despite knowing that we risk failure is perhaps the greatest form of courage.
Quote from this good inspirational free book: http://bookboon.com/en/business-ebooks/career/ignite-your-career.
They have other free books, too, so check it out. Not all of them are worth it, though.