20. Since we are not entitled to make desire the test by which to decide on the nature and quality of the good, we may perhaps have recourse to judgement.
We would apply the opposition of things- order, disorder; symmetry, irregularity; health, illness; form, shapelessness; real-being, decay: in a word continuity against dissolution. The first in each pair, no one could doubt, belong to the concept of good and therefore whatever tends to produce them must be ranged on the good side.
Thus virtue and Intellectual-Principle and life and soul- reasoning soul, at least- belong to the idea of good and so therefore does all that a reasoned life aims at.
Why not halt, then- it will be asked- at Intellectual-Principle and make that The Good? Soul and life are traces of Intellectual-Principle; that principle is the Term of Soul which on judgement sets itself towards Intellectual-Principle, pronouncing right preferable to wrong and virtue in every form to vice, and thus ranking by its choosing.
The soul aiming only at that Principle would need a further lessoning; it must be taught that Intellectual-Principle is not the ultimate, that not all things look to that while all do look to the good. Not all that is outside of Intellectual-Principle seeks to attain it; what has attained it does not halt there but looks still towards good. Besides, Intellectual-Principle is sought upon motives of reasoning, the good before all reason. And in any striving towards life and continuity of existence and activity, the object is aimed at not as Intellectual-Principle but as good, as rising from good and leading to it: life itself is desirable only in view of good.