"It's absolutely absurd to treat the sky as if it were an open sewer."
"The future of 2030 depends on our decision to invest in adolescent girls."
"Science shouldn't be a luxury, knowledge should not be a commodity."
"One man with courage is a majority, each one of you can be a majority of one."
"The only thing that happened when I got shot was that weakness, fear and hopelessness died."
"You move things forward just by talking about them."
"It's not renewable energy, it's rational energy."
"Education isn't simply about literacy, it's about giving girls back their power."
"Change comes from the inside out."
"In most parts of the world, when a girl is born, her wings are clipped. She is not able to fly."
It's not often that you hear from former United States Vice President Al Gore, girls' education advocate Malala Yousafzai and Gates Foundation co-chair Melinda Gates on the same day, much less from the same stage.
The three public figures represent just a small sampling of the dazzling lineup of speakers on the second day of the Social Good Summit.
See also: How to Follow Social Good Summit Online
The diverse group of speakers tackled the challenging question of how we can best prepare for #2030NOW. One of the focal points of the day's conversations was climate change, and a series of panels addressed the myriad of ways to mobilize the connected generation for the health of our planet.
We've rounded up some memorable and moving quotes from the main stage on Monday. Who was your favorite speaker of the day? What did they say that stuck with you? Let us know in the comments below.
Image: Mashable, Casey Kelbaugh