Idea of Good, Acting Wisely, Contemplation

In book VII of the Republic, Plato's metaphorical Sun, the Idea of Good, is presented as a necessary condition if one is to "act wisely".  The analogy thus suggests two ways that it might function as such.  One is that is guides one to an appropriate action, just as the Sun makes some object visible.  The other is that it empowers one to such action, just as the Sun, via photosynthesis and carbohydrates, energizes one.  But, neither of these is how he conceives the requisite interaction with the Sun.  Rather, the attitude that he exalts is Contemplation, for which there is no clear justification.  For, since Contemplation is distinct from the Idea of Good, there is nothing inherently Good about it.  Furthermore, in the absence of a systematic account of the relation between the Contemplation of the Idea of Good and acting wisely, the former can be an impediment to the latter, as Schopenhauer brings out in his concept of Platonic Contemplation as quelling any Action.  So, the traditional Philosophical privileging of Theory over Practice begins in a lacuna at the heart of Plato's solar metaphor.