from:
http://www.al-islam.org/al-serat/jihad-nasr.htm
To understand the spiritual significance of jihad and its wide application to nearly every aspect of human life as understood by Islam, it is necessary to remember that Islam bases itself upon the idea of establishing equilibrium within the being of man as well as in the human society where he functions and fulfills the goals of his earthly life. This equilibrium, which is the terrestrial reflection of Divine Justice and the necessary condition for peace in the human domain, is the basis upon which the soul takes its flight towards that peace which, to use Christian terms, 'passeth understanding'.
If Christian morality sees the aim of the spiritual life and its own morality as based on the vertical flight towards that perfection and ideal which is embodied in Christ, Islam sees it in the establishment of an equilibrium both outward and inward as the necessary basis for the vertical ascent.
The very stability of Islamic society over the centuries, the immutability of Islamic norms embodied in the Shari'ah, and the timeless character of traditional Islamic civilization which is the consequence of its permanent and immutable prototype are all reflections of both the ideal of equilibrium and its realization as is so evident in the teachings of the Shari'ah (or Divine Law) as well as works of Islamic art, that equilibrium which is inseparable from the very name of islam as being related to salam or peace.
The preservation of equilibrium in this world, however, does not mean simply a static or inactive passivity since life by nature implies movement. In the face of the contingencies of the world of change, of the withering effects of time, of the vicissitudes of terrestrial existence, to remain in equilibrium requires continuous exertion. It means carrying out jihad at every stage of life.
Human nature being what it is, given to forgetfulness and the conquest of our immortal soul by the carnal soul or passions, the very process of life of both the individual and the human collectivity implies the ever-present danger of the loss of equilibrium and the fact of falling into the state of disequilibrium which if allowed to continue cannot but lead to disintegration on the individual level and chaos on the scale of community life.
To avoid this tragic end and to fulfill the entelechy of the human state which is the realization of unity (al-tawhid) or total integration, Muslims as both individuals and members of Islamic society must carry out jihad, that is they must exert themselves at all moments of life to fight a battle both inward and outward against those forces that if not combatted will destroy that equilibrium which is the necessary condition for the spiritual life of the person and the functioning of human society. This fact is especially true if society is seen as a collectivity which bears the imprint of the Divine Norm rather than an antheap of contending and opposing units and forces.
