The struggle in yourself..the constant dilemma b/w being good or bad...

" Perhaps the fight between GOOD & EVIL
is raging all the time in every individual's heart,
which is the battleground for all Angels & Devils;
they would fight inch by inch for thousands of millennia
in order to gain ground, until one of them finally vanquished the other"

got this from a book "THE DEVIL AND MISS PRYM" by Paulo Coelho.
quite like his book.