The United States and other wealthy countries need to downscale their lifestyles and try to focus more on inner contentment, the Dalai Lama said Sunday.

There simply aren’t enough natural resources on the planet to support all 6 billion people on Earth imitating western lifestyles. Because there are limitations on external material resources, but not on internal ones, it’s better to seek contentment and peace rather than material things, he said.

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The psychology professor is smiling. It’s a warm day in Cambridge, the first in a while, and the sun coming in through the window shines off his endearingly bald head. “The Hair of the Man,” a poem celebrating the joys of baldness, decorates the wooden door to his corner office on the 14th floor of William James. Entering his office is not unlike asking him a question—the result is a stream of new ideas and unexpected discoveries. On the giant bulletin board, strands of jewel-toned Mardi Gras beads dangle over journal articles and newspaper clippings. Tucked among his framed photographs is a picture from his meeting with the Dalai Lama. Rows of uneven books, different sizes and colors, line his shelves, but many are translations of the same one: his New York Times-bestseller, “Stumbling on Happiness.”