If we know our  enemy we can be alert and take precautions .. sometimes what we dont know is inside of our head we ourself pamper and nurture a giant one(worse than any foe we ever can find) day by day.. & one day all of sudden it starts working against us.. that is the battle some time people lose in such a way that, they lose the grip of own life!! Budha once said "what you think, you becomes"!choose your words in head carefully always remember if you feed your giant these thoughts, definitely it will backfire you once!