Buddha is eternal. His knowledge is eternal. His experience is eternal. His fruits of actions are eternal. And we know that past Knowledge , past experience ,past actions are remembered by Self. So my question is who remembers the past existences of Buddha ? Is it the Self? If it is the Self then that Self must also be immortal because Buddha is immortal.
EDIT: This was naive attempt to ask a genuinely logical question "Who remembers the Buddha?"
I guess I have found an answer in the Manual of Buddhism by Spence Hardy. It is the Brahma who remembers the Buddha. I quote from p.88:
The beings who will in due course become Budhas are called Bodhisat. They are numberless ; but the name, in common usage, is almost exclusively confined to those who have become avowed candidates for the high office. When many ages have elapsed without the appearance of a Budha, there arc no beings to supply the continued diminution of the numbers in the brahma-lokas. This excites the attention of some compassionate brahma, who, when he has discovered the cause and the remedy, looks, out to see in what world the Bodhisat exists who will next become an aspirant for the Budhaship ; and when he has discovered the Bodhisat in question, he inspires him with the resolution that enables him to form the wish to become the teacher of the three worlds, that he may release sentient beings from the evils of existence. The ages that succeed this period are divided into three eras; in each of which we have legends of Gotama. 1. The era of resolution (1). 2. The era of expres-, sion (2). 3. The era of nomination (3).