In plain words
Whoever does not know his own reality is the bound soul, caught up in creation and all that goes with it. Whoever knows his own reality is ever present and pure: he is Shiva himself. Discern this, without doubt.
Word for word
One who does not know one's reality is the bound being subject to creation and its conditions. Whoever knows one's reality is ever-existent and pure, Shiva himself. Discern this without doubt.