Black Elk said this quote

Crazy Horse dreamed and went into the world where there is nothing but the spirits of all things. That is the real world that is behind this one, and everything we see here is something like a shadow from that one.

~ Black Elk

The first peace, which is the most important, is that which comes within the souls of people when they realize their relationship, their oneness with the universe and all its powers, and when they realize at the center of the universe dwells the Great Spirit, and that its center is really everywhere, it is within each of us.

~ Black Elk

Perhaps you have noticed that even in the slightest breeze you can hear the voice of the cottonwood tree; this we understand is its prayer to the Great Spirit, for not only men, but all things and all beings pray to Him continually in different ways.

~ Black Elk

But now that I can see it all as from a lonely hilltop, I know it was the story of a mighty vision given to a man too weak to use it; of a holy tree that should have flourished in a people’s heart with flowers and singing birds, and now is withered; and of a people’s dream that died in bloody snow.

~ Black Elk