It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. Carl Sagan

We are the product of 4.5 billion years of fortuitous, slow biological evolution. There is no reason to think that the evolutionary process has stopped. Man is a transitional animal. He is not the climax of creation. Carl Sagan

To make an apple pie from scratch, you must first invent the universe. Carl Sagan

A central lesson of science is that to understand complex issues (or even simple ones), we must try to free our minds of dogma and to guarantee the freedom to publish, to contradict, and to experiment. Arguments from authority are unacceptable. Carl Sagan
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Everything should be made as simple as possible, but not simpler. Albert Einstein

Common sense is the collection of prejudices acquired by age eighteen. Albert Einstein

The important thing is not to stop questioning. Curiosity has its own reason for existing. Albert Einstein

A man sits with a pretty girl for an hour, it seems like a minute. He sits on a hot stove for a minute, it’s longer than any hour. That is relativity. Albert Einstein

Before God we are all equally wise – and equally foolish. Albert Einstein
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