Jacques Barzun on True Work

I cannot remember where I got this quote, but it impressed itself on me so much that I had it posted in my office cubicles for years, on my old Google blog site, and on my old Tumblr site. I love it so much I want to post it again.

True Work is that which occupies the mind and the heart, as well as the hands. It has a beginning and an ending. It is the overcoming of difficulties one thinks important for the sake of results one thinks valuable.
— Jacques Barzun