Since the formation can be understood as a material form gaining process, we can comprehend a formation through influencing factors: material causes, formal causes, effective causes, and targetoriented causes. Aristotle said that target-oriented (teleological) causes were the ones that provide a competent form to the formation. Thus, if we reveal the targets of formations, then we can achieve a true comprehension. That is to say, in order to understand the things, one should consider the form, rather than the material. For instance, target of an acorn is to be an oak tree.