Unlike the animal world, man’s evolution takes place primarily inwardly, in his inner consciousness. Following the logic of nature it is inevitable that after this inner evolution reaches a certain ceiling, there is bound to be an outer evolution as well. A new form, superhuman so to say, is bound to appear as a last result of human evolution. However, it takes time for a seed to germinate in darkness and slowly prepare it for light. It cannot happen immediately. Time is needed. It is a journey from Diti(divided nature) to Aditi(divine nature), from darkness to Light, from Ignorance to Knowledge.
Yoga means union with the Divine. In practice it implies coming in contact with and being established in higher and higher states of consciousness. It is the means to grow in spiritual and eventually the Divine Consciousness.