In PDF form, from John Hagel III, John Seely Brown and Lang Davison. Hagel further defines passion in this other blog post as… (Source)
…strong emotions that motivate us to move beyond our comfort zone and to achieve the potential that resides within us. Passion comes from within each of us; it cannot be imposed or mandated from outside. At the same time, it compels us to move outside, to engage with the world around us.