struggle against the self

"That the Prophet (S) dispatched his soldiers to battle front to fight against the enemy. When the soldiers returned triumphant, the Prophet said: ' Congratulations! For those who have successfully completed the "Minor-Struggle " (Jihad-e-Asghar), but they have yet to engage themselves into Greater-Struggle (Jihad-e-Akbar) '.

He was asked: 'Oh Prophet of God! What is the Greater- Struggle?”

 'Struggle against the self.’ Replied the Prophet (S).”

(Wasail al-Shia, vol. 2, p-124)