Calendars and clocks exist to measure time, but that signifies little because we all know that an hour can seem as eternity or pass in a flash, according to how we spend it.
“Conventional dogmas, even if endowed with the authority of an Aristotle - ancient or modern - must be tested vigorously. If they are found wanting, we need not bother with them. But if they are found to be substantially correct, we may not overlook them.”