Whether to be eternal belongs to God alone?

Objections

Objection 1 : It seems that it does not belong to God alone to be eternal. For it is written that "those who instruct many to justice," shall be "as stars unto perpetual eternities [*Douay: 'for all eternity']" (Dan. 12:3). Now if God alone were eternal, there could not be many eternities. Therefore God alone is not the only eternal.
Objection 2 : Further, it is written "Depart, ye cursed into eternal [Douay: 'everlasting'] fire" (Mt. 25:41). Therefore God is not the only eternal.
Objection 3 : Further, every necessary thing is eternal. But there are many necessary things; as, for instance, all principles of demonstration and all demonstrative propositions. Therefore God is not the only eternal.