They must often change, who would be constant in happiness or wisdom. Those who continually search for happiness will never find it. Happiness is made, not found. To be without some of the things you want is an indispensable part of happiness.
The eco-effective future of industry is a world of abundance that celebrates the use and consumption of products and materials that are, in effect, nutritious - as safe, effective, and delightful as a cherry tree.