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INDIANAPOLIS, Ind.– The Dalai Lama spoke Sunday at the U.S. Conference of Mayors 84th Annual Meeting in Indianapolis. Following his address, Lady Gaga joined him for a question-and-answer session moderated by journalist Ann Curry.

The Dalai Lama delivered keynote remarks focusing on the global significance of building compassionate cities.

He said liberty, freedom and democracy are America’s best principles.

All of the world’s problems are self-created, he said. He provided examples of global warming, population increase and limited resources. He also said humans pay too much attention to materialistic things.

He spoke of the importance of inner beauty and being compassionate. Keeping a calm mind in the face of difficulty, he said, is important.

During the question-and-answer session, Lady Gaga said humans must work together in the face of evil.

“As we’re busy trying to figure out which group is causing the problem, evil is winning…we have to change the perspective,” she said.

She said mayors should work with the young people in their cities to develop kindness and compassion. She said young people are confused with all the fear in the world now.

“We need to educate them. You have the power to be kind to them,” she said.

The event wasn’t open to the general public—and the Dalai Lama and Lady Gaga aren’t the only notable guests set to appear at the event. Presumptive Democratic presidential nominee Hillary Clinton will speak to the group Sunday as well.