"The years between eighteen and twenty-eight are the hardest, psychologically. It’s then you realize this is make or break, you no longer have the excuse of youth, and it is time to become an adult – but you are not ready."
"There is no other species on the Earth that does science. It is, so far, entirely a human invention, evolved by natural selection in the cerebral cortex for one simple reason: it works. It is not perfect. It can be misused. It is only a tool. But it is by far the best tool we have, self-correcting, ongoing, applicable to everything. It has two rules. First: there are no sacred truths; all assumptions must be critically examined; arguments from authority are worthless. Second: whatever is inconsistent with the facts must be discarded or revised. We must understand the Cosmos as it is and not confuse how it is with how we wish it to be."
Carl Sagan, in Cosmos. New York: Random House. 1980: p.332
We must not confuse how things are with how we wish them to be.