Your worst enemy is hiding within yourself, and that enemy is your nafs or false ego.
Never have I dealt with anything more difficult than my own soul, which sometimes helps me and sometimes opposes me.
My Nafs screams out for what it desires. But my will to be free screams louder.
Change your 'Nafs', change the world.
His constant fight is with the Nafs (self-interest), the root of all disharmony and the only enemy of man. By crushing this enemy man gains mastery over himself; this wins for him mastery over the whole universe, because the wall standing between the self and the Almighty has been broken down. Gentleness, mildness, respect, humility, modesty, self-denial, conscientiousness, tolerance and forgiveness are considered by the Sufi as the attributes which produce harmony within one's own soul as well as within that of another.
Your nafs (souldesires) is your first battlefield. If you are victorious over it, then you will find the other battlefields easier.