The Gita defends knowledgeKnowledge as a way to spiritual perfectionSpiritual perfection, since for it the highest knowledgeKnowledge is the knowledgeKnowledge of BrahmanBrahman, the ultimate reality. As already discussed in the previous chapter, actionAction needs knowledgeKnowledge and belief which are the cognitive aspects of the performance of actionAction. The willWill which is the primary source of actionAction is aided by reasonReason so that an actionAction becomes a perfect actionAction in the moral sense of the term. Moral actions are the dharma- or duty-based actions which the Gita defines as the highest forms of actionAction.