"There are only two endless things: The universe, and the human stupidity." - Alfred Einstein
Both funny and true at the same time.
Actually Einstein was wrong about the universe in that statement and later realised that himself. In the mean time his belief in an endless universe caused him to introduce a 'cosmological constant' in his theory, something he later describe as being the biggest blunder of his life. See here or here.
Not meant critically, just an interesting aside






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