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For then we were speaking of opposites in the concrete , and now of the essential opposite which , as is affirmed , neither in us nor in nature can ever be at variance with itself : then , my friend , we were speaking of things in which opposites are inherent and which are called after them , but now about the opposites which are inherent in them and which give their name to them ; these essential opposites will never , as we maintain , admit of generation into or out of one another . These essential questions will be explored through the lens of the Christian Spiritual tradition . These essential elements will provide a basis for identifying domains for measuring cultural competence , as discussed in the Section II. B of this report .