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Mujāhada, a collateral form of jihād (the so-called "holy war"), taken [by Sufis] to mean "earnest striving after the mystical life." The term is based on the Koranic text, "And they that strive earnestly in Our cause, them We surely guide upon Our paths." A Tradition makes the Prophet rank the "greater warfare" (al jihad al-akbar) above the "lesser warfare" (al jihad al-asghar, i.e., the war against infidelity), and explain the "greater warfare" as meaning "earnest striving with the carnal soul" (mujāhadat al-nafs).
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A.J. Arberry (Sufism: An Account of the Mystics of Islam)