— of the appearances of presence and absence; — externality; — an adventitious qualification; — is held (to be); — not; — (their) essential nature; — (their) being / existence; — therefore; — of them (the appearances); — which are inner; — existing, real; — always
For the appearances of presence and absence, externality is held to be an adventitious qualification, not their essential nature; therefore their being is always that of inner, ever-existing (realities).