"Sciential Number is that which Pythagoras defines as the extension and production into act of the seminall reasons which are in the Monad, or a heap of Monads, or a progression of multitude beginning from Monad, and a regression ending in Monad. ... They make a difference between the Monad and One, conceiving the Monad to be that which exists in intellectualls; One, in numbers [or as Moderatus expresseth it, Monad among numbers, One amongst things numbred, one being divisible into infinite; thus Numbers and things numbred differ, as incorporealls and bodies] in like manner Two is amongst numbers. The Duad is indeterminate; Monad is taken according to equality and measure, Duad according to excess and defect: mean and measure cannot admit more and lesse, but excesse and defect (seeing that they proceed to infinite) admit it; therefore they call the Duad indeterminate, holding Number to be infinite, not that number which is separate and incorporeall, but that which is not separate from sensible things."