Authors:

The old Lakota was wise. He knew that man's heart, away from nature, becomes hard; he knew that lack of respect for growing, living things soon led to lack of respect for humans too.

Luther Standing Bear (1978). “Land of the Spotted Eagle”, p.197, U of Nebraska Press
The old Lakota was wise. He knew that man's heart, away from nature, becomes hard; he knew that lack of respect for growing, living things soon led to lack of respect for humans too.