। ॥
In plain words
I do not age. I do not perish. I am the knowing itself. I am the awareness of the inward Self. I am made of nothing but the highest bliss. I am supreme Śiva. I am — whole, full on every side, with nothing left out.
Close to the Sanskrit
Undecaying am I, imperishable am I, the knower am I, the awareness of the inward Self am I; made wholly of supreme bliss am I, supreme Śiva am I — I am entirely full.