Understanding personhood as fundamentally illusory does not mean one should push it down, and act as if it has no purpose.
"Persona" is Latin for "mask," as in one worn by a character in a play.
"Illusion" comes from the Latin "ludere," meaning "to play."
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Seeing it for what it is, you're finally able to really *play* along!
An actor in a play doesn't stop playing because he realizes the character has no real existence. He instead has a blast at it, knowing it all to be a play.
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And the beauty of it is that whatever way you choose to proceed—lightly or seriously—that's just your way of acting out your ephemeral role; your "dramatis persona."