The dyad gets its name from passing through or asunder; for the dyad is the first to have separated itself from the monad, whence also it is called "daring." For when the monad manifests unification, the dyad steals in and manifests separation.
IamblichusAll things in the world of Nature are not controlled by Fate for the soul has a principle of its own.
IamblichusThe Triad has a special beauty and fairness beyond all numbers, primarily because it is the very first to make actual the potentiality of the Monad - oddness, perfection, proportionality, unification, limit.
IamblichusIf the potential of every number is in the monad, then the monad would be intelligible number in the strict sense, since it is not yet manifesting anything actual, but everything conceptually together in it.
Iamblichus