Life began with the most basic purpose of all: survival and reproduction. For 3.5 billion years organisms have survived and reproduced in a lineal descent from the pre-Cambrian to us, an unbroken continuity that has endured countless terrestrial and extraterrestrial assaults and five mass extinctions (six if you count the one we may be causing). This fact alone imbues us with a sense of cosmic purpose. Add to it the innumerable evolutionary steps from bacteria to big brains, and the countless points along the journey in which our lineage could have easily been erased, and we arrive at the conclusion that we are a glorious contingency in the history of life. As Charles Darwin wrote in the penultimate paragraph of his 1859 masterpiece On the Origin of Species: “When I view all beings not as special creations, but as the lineal descendants of some few beings which lived long before the first bed of the Silurian system was deposited, they seem to me to become ennobled.”
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