Sentence:  It is the measure of things, and their time (that is, their measure, as to space and time), and yet it is above, and prior to, time: it is full in <WSD>needy</WSD> things, and overflows in full things; it is unutterable, innominable: it is above understanding ... 
Meaning of the word marked with <WSD> tags:  Needful; necessary.