ANAGRAM RIDDLE

Why do we fast and sometimes deliberately do without certain comforts?

Fill in the blanks with the answer words - which make up an anagram of SELF-DENIAL and will complete the sentence below.

SELF-DENIAL  _ _ _ _ _   _   _ _ _ _ .

Answer:

SELF-DENIAL FILLS A NEED.

Credit:
The Enigma 
NPL Magazine - July, 2012
WRYBOSH  (adapted)