Eckhart Tolle explains how ancient peoples directly sensed the aliveness and sacredness of trees, treating groves as sacred sites for spiritual ceremonies. Modern humans have lost this intuitive perception, relating to trees only through abstract concepts instead of felt experience.
Chapters
So you sense the aliveness of the tree, its beingness, and then you come to that what ancient cultures knew, and we have to use that word, and that's the fringe of God, so to speak. You sense the sacredness of the tree. You sense the sacredness of this life form. And you then— what arises then is a certain— Respect. Respect for the life form of the tree. In many ancient cultures, trees were considered sacred, and in some— and sometimes they chose particular trees that were particularly sacred. And often ceremonies, religious spiritual ceremonies, were performed and where there were groves of trees, and people get drawn there because they could sense It's the energy field that emanates from those trees. Now, the modern human cannot sense that because the modern human only knows the tree through conceptualization.