What is the meaning of the Zen quote: "Before Enlightenment chop wood, carry water. After enlightenment chop wood, carry water"?

In the question *"A question regarding the level of worldly participation for a buddhist monk"* , Bhante gave an answer containing a Zen quote. The quote is; >"Before Enlightenment chop wood, carry water. After enlightenment chop wood, carry water". - What is the origin of the quote? - What is the meaning of the quote? Thank you for your time.