God exists by Himself; He is Ever-Lasting. He is not created, so He is not demolishable. This is because anything which can be created, can be destroyed as well.
He is the Absolute Ever-Lasting: This conveys the concept that He always is, never to end. He is Absolute Old since He does not have any first. In short: He is Eternal.
If a God’s servant submits to God’s will, then he will join God’s Eternality.
source : The Book: Diar Aashiqan by prof, Hussain Ansarian