“Not one of your pertinent ancestors was squashed, devoured, drowned, starved, stranded, stuck fast, untimely wounded, or otherwise deflected from its life's quest of delivering a tiny charge of genetic material to the right partner at the right moment in order to perpetuate the only possible sequence of hereditary combinations that could result, eventually, astoundingly, and all too briefly, in you.”
— Bill Bryson
From A Short History of Nearly Everything (2003), Chapter 30. Bryson's summary of the statistical impossibility of any individual's existence.
I spent three years reading about the universe. The fact that hit me hardest: you are here. The odds against your existence cannot be written down. Every ancestor survived long enough to pass on exactly the right combination. One different moment, one different choice, and someone else would be reading this. You are not ordinary. You are astronomically improbable. Act like it.