What does "Know Thyself" Mean ? Ancient Mystic Philosophy = Self-Realization/Actualization

How can we follow the exhortations of the greatest mystics and philosophers? The end product of "Know Thyself" is that we are more in tune with our divine soul and can see and experience the eternal dimensions of spirituality that emanate through the universe. This is the intellectual and philosophical basis of Mysticism and concepts of spiritual Enlightenment.