With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Empedocles noted the limitation and narrowness of human perceptions. We see only a part but fancy that we have grasped the whole. But the senses cannot lead to truth; thought and reflection must look at the thing from every side. It is the business of a philosopher, while laying bare the fundamental difference of elements, to show the identity that exists between what seem unconnected parts of the universe.
text_B: If you use only thought and reflection, will the thing have been thoroughly examined?
YES.