First of all, thank you taking the time to answer. I'll read the article very carefully.
Examples of which common sense we (supposedly) all are agree?
to avoid falling into a maddening relativism. — WaterLungs
Answer: When we stop thinking about the ultimate nature of reality and grab a cup of coffee, accepting it's real enough from a pragmatic point-of-view. This acceptance is not an epistemological agreement between everyone... but a common sense acceptance that we need to suspend disbelief temporarily, to continue living life without questioning everything. Otherwise we couldn't leave our beds, because we would be trying to rationally justify/find a reason or a purpose to every single action we take. Here nature is important, were alive because breathing is automatic and doesn't depend on rational deliberations: a radical skeptic would die if breathing depended on his epistemological certainties.
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I think Hume describes this much better than me:
“Where am I, or what? From what causes do I derive my existence, and to what condition shall I return? ... I am confounded with all these questions, and begin to fancy myself in the most deplorable condition imaginable, environed with the deepest darkness, and utterly deprived of the use of every member and faculty.
Most fortunately it happens, that since Reason is incapable of dispelling these clouds, Nature herself suffices to that purpose, and cures me of this philosophical melancholy and delirium, either by relaxing this bent of mind, or by some avocation, and lively impression of my senses, which obliterate all these chimeras. I dine, I play a game of backgammon, I converse, and am merry with my friends. And when, after three or four hours' amusement, I would return to these speculations, they appear so cold, and strained, and ridiculous, that I cannot find in my heart to enter into them any farther.”