Carl Sagan

"Genes are selfish, but we are not bound by our genes."

"We are capable of bad things, but we also have a remarkable capacity for good."

"To understand the cosmos, you must understand how stars die."

"The fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses."

"You have to know the past to understand the present."

"When you're in love, you want to do things for them."

"Every star may be a sun to someone."

"Science is a way of thinking much more than it is a body of knowledge."

"A type two civilization would be significantly more powerful than us."

"Pay attention to it. Curiosity is the antidote to fear."

"The neurochemistry of love is not fully understood."

"How is it that hardly any major religion has looked at science and concluded, 'This is better than we thought'?"

"We have designed our civilization based on short-term thinking."

"Extraordinary claims require extraordinary evidence."

"What is the most important thing you could be doing with your life right now?"

"The cosmos does not owe us gratification."

"Science is of the essence for democracy."

"To understand the living world, you must understand the dead."

"The known is finite, the unknown infinite."

"We need to make science interesting and relevant to everyone."

"The beauty of the scientific method is that it doesn't rely on authority."

"In the vast cosmic perspective, our religious differences are minuscule."

"We are unique by virtue of our sapience and our capacity for understanding."

"Persistence in the face of setbacks is heroic."

"Art is the mathematics of passion."

"We are made of star stuff contemplating the stars."

"The pursuit of truth is noble and necessary."

"Patience is a key virtue for both science and life."

"We should be humble about our place in the universe."

"Technology is not inherently good or bad; it depends on its use."