"Attributes of God: eternity, knowledge, and Providence" (Murray amp; Rea) 35-63 According to Murray and Rea why do some philosophers argue that God...

"Attributes of God: eternity, knowledge, and Providence" (Murray & Rea) 35-63

According to Murray and Rea why do some philosophers argue that God must be eternal/timeless?

What reasons do Murray and Rea give for thinking that a perfect being (a.k.a God) would have to be everlasting/temporal (i.e. able to experience time)?