Two or three million years ago, the Earth was a ball of fire, revolving arround it's own axis. It took millions of years to cool under the constant downpour of rain. The Process was slow, imperceptible, but the gradual change - transition - came to pass. Same for generation after generation of evolution on Earth. Nature never jumps. She works in a leisurely manner, experimenting continuously. The same natural transition can be seen in man. This gradual change, transition, works every where, silently building storms and destroying soloar systems.
It is a secret which every intellectual man quickly learns, that, beyond the energy of his possessed and conscious intellect, he is capable of a new energy (as of an intellect doubled on itself), by abandonment to the nature of things; that, beside his privacy of power as an individual man, there is a great public power, on which he can draw, by unlocking, at all risks, his human doors, and suffering the ethereal tides to roll and circulate through him: then is he caught up into the life of the Universe, his speech is thunder, his thought is law, and his words are universally intelligible as the plants and animals.