Question

2. Does power corrupt automatically? Apply this famous expression to the events and characters in Macbeth. You can focus on a single character or several. You may take the position that it always corrupts, never corrupts, or sometimes corrupts, but be sure to provide textual support.

Answer 1

The 'famous expression' is actually "Absolute power corrupts absolutely" said by by John Emerich Edward Dalberg Acton, first Baron Acton (1834–1902). 
He actually said, in a letter to Bishop Mandell Creighton in 1887: "Power tends to corrupt, and absolute power corrupts absolutely.