Some 'S's,
Code:
Category: Quotation from a book
Letters Left: _BC__FGHIJKL__OPQRS_UVWXYZ
A S _ N _ _ E M A N _ N _ _ S S E S S _ _ N
_ _ A _ _ _ D _ _ _ T _ N E M _ S T _ E
_ N _ A N T _ _ A _ _ _ E
I'm going to pause for a few hours and see if anyone gets it from this.