Our last study dealt with the mother virtue of Brotherhood, which harmonizes the
different units of the human kingdom and produces unity. In our efforts to practise
brotherliness towards all men and women each one of us finds numerous obstacles.
Theosophy traces the root cause of all of them to the duality which is within man. Good
and evil are struggling in the blood of every human being. Virtues and vices are waging
a war in the individual and as long as the war lasts there is neither peace for himself
nor brotherliness towards others. The Esoteric Philosophy teaches that the source of
both good and evil is within man, not outside of him. It warns us against the religious
doctrine that places the Devil, Satan, Ahriman, or God, Creator, Ahura Mazda outside of man.
B.P. Wadia Studies in the Secret Doctrine