The great point in Christianity is the search for an independent content for spiritual life which, according to the insights of its founder, could be elevated, not by the forces of a world external to the soul of man, but by the revelation of a new world within his soul. Islam fully agrees with this insight and supplements it by the further insight that the illumination of the new world thus revealed is not something foreign to the world of matter but permeates it through and through. Thus the affirmation of spirit sought by Christianity would come not by the renunciation of external forces which are already permeated by the illumination of spirit, but by a proper adjustment of man's relation to these forces in view of the light received from the world within.
Muhammad Iqbal, The Reconstruction Of Religious Thought In Islam
christianity, islam, materialism, spirituality