13.4 What the 'Field is' namely, what its substance is; what it is 'like', namely, what things depend on it; what its 'modifications' are, namely, what its transformations are; what the 'purpose' is for which it has been originated; 'what it is,' namely, what its true nature is; 'who it is,' namely, who the individual self is and what Its nature is like; what Its 'powers', are, namely, what powers It possesses. All this, briefly learn from Me.