He came to be known as Adiyogi, the first yogi. And it was he who bequeathed the science of yoga to seven disciples, who later carried it around the world. What he imparted to these disciples was an unimaginably profound system of self-exploration and transformation, based on the radical premise that it is possible for a human being to evolve consciously. Unlike biological evolution, which happens without our conscious participation, spiritual evolution can happen consciously.