(Wajib al wujud bil ghayr). That which is made necessary through another being whose existence is necessary in itself'. This is the possible or contingent thing. Its existence depends totally upon Allah, Who is Necessary Being. The slave of Allah has utter awareness of this situation. Lordship is the most exalted level and slavehood is the lowest level. There is nothing more lowly than to be subject to the locus of nothingness and to stand in need of another for one's own existence. The knower knows that there is only One Existence yet, through his perfect spiritual courtesy towards his Lord, he always clings to his slavehood.