"We cannot segregate the human heart from the environment outside us and say that once one is reformed everything will be improved. Man is organic and with the world. His inner life moulds the environment and is itself deeply affected by it. The one acts upon the other and every abiding change in the life of man is the result of these mutual reactions."
- Shoghi Effendi, letter to an individual Baha'i dated 17 February 1933
I found it in this document: Conservation and Sustainable Development in the Baha'i Faith