“That's fine in practice, but will it work in theory?”
“The Law of Attraction is a theory. Cosmic Ordering is a practice putting that theory to work.”
“In theory, there is no difference between theory and practice. But in practice, there is.”
“Theory is the practice of the impotent.”
“The equally is a political theory, but no a practical politics.”
“My theory is to enjoy life, but the practice is against it.”