Let his heart be changed from man's, and let a beast's heart be given unto him; and let seven times pass over him.
Let his heart be changed from man's - "heart," understanding (Isaiah 6:10, "Make the heart of this people fat").
Seven times - i:e., years (Daniel 12:7). "Seven" is the perfect number: a week of years: a complete revolution of time accompanying a complete revolution in his state of mind.