and Tom Waits said it first: "a diamond that wants to stay coal"
Also from Tom Waits and wonderful to reflect on; a favorite notion I never get tired of considering: (never let the weeds grow higher than the garden), "always keep a sapphire in the mind. Always keep a diamond in the mind."
can't think of anything *I* need to add!
* I'm sure many masters said it all many times over the eons. Just wanted to credit T.W. for the way he put it.