In the Buddhist scriptures, there is a certain
class of questions for which the Buddha will customarily not provide an
answer. These are called 'the undetermined questions'. They were often
asked by a character called Vacchagotta, who was described as a wandering
ascetic.
Vachagotta would ask questions such as these:
"Now then, Master Gotama, is the cosmos eternal?"
“Then the wanderer Vacchagotta went to the Blessed One and, on arrival, exchanged courteous greetings with him. After an exchange of friendly greetings & courtesies, he sat to one side. As he was sitting there he asked the Blessed One: "Now then, Venerable Gotama, is there a self?"
When this was said, the Blessed One was silent.
"Then is there no self?"
A second time, the Blessed One was silent.
Then Vacchagotta the wanderer got up from his seat and left.
Then, not long after Vacchagotta the wanderer had left, Ven. Ananda said
to the Blessed One, "Why, lord, did the Blessed One not answer when
asked a question by Vacchagotta the wanderer?"
"It's just as if a man were wounded with an arrow thickly smeared with poison. His friends & companions, kinsmen & relatives would provide him with a surgeon, and the man would say, 'I won't have this arrow removed until I know whether the man who wounded me was a noble warrior, a priest, a merchant, or a worker.' He would say, 'I won't have this arrow removed until I know the given name & clan name of the man who wounded me... until I know whether he was tall, medium, or short... until I know whether he was dark, ruddy-brown, or golden-colored... until I know his home village, town, or city... until I know whether the bow with which I was wounded was a long bow or a crossbow... until I know whether the bowstring with which I was wounded was fiber, bamboo threads, sinew, hemp, or bark... “.
About the various viewpoints which Vacchagotta is enquiring about, the Buddha calls them:
“a thicket of views, a wilderness of views, a contortion of views, a writhing of views, a fetter of views. These views are accompanied by suffering, distress, despair, & fever, and do not lead to disenchantment, dispassion, cessation; to calm, direct knowledge, full Awakening, Unbinding.”
The Buddha does not have such views, or indeed, any position whatever.
"A 'position,' Vaccha, is something that a Tathagata has done away with. What a Tathagata sees is this: 'Such is form, such its origin, such its disappearance; such is feeling, such its origin, such its disappearance; such is perception... such are mental fabrications... such is consciousness, such its origin, such its disappearance.' Because of this, I say, a Tathagata — with the ending, fading out, cessation, renunciation, & relinquishment of all construings, all excogitations, all I-making & mine-making & obsession with conceit — is, through lack of clinging/sustenance, released."
Finally the Buddha sets poor Vacchagotta straight:
Of course you're befuddled, Vaccha. Of course you're confused. Deep, Vaccha, is this phenomenon, hard to see, hard to realize, tranquil, refined, beyond the scope of conjecture, subtle, to-be-experienced by the wise. For those with other views, other practices, other satisfactions, other aims, other teachers, it is difficult to know. That being the case, I will now put some questions to you. Answer as you see fit. What do you think, Vaccha: If a fire were burning in front of you, would you know that, 'This fire is burning in front of me'?"
"...yes..."
"And suppose someone were to ask you, Vaccha, 'This fire burning in front of you, dependent on what is it burning?' Thus asked, how would you reply?""...I would reply, 'This fire burning in front of me is burning dependent on grass & timber as its sustenance.'"
"If the fire burning in front of you were to go out, would you know that, 'This fire burning in front of me has gone out'?"
"...yes..."
"And suppose someone were to ask you, 'This fire that has gone out in
front of you, in which direction from here has it gone? East? West?
North? Or south?'
Thus asked, how would you reply?"
"That doesn't apply, Master Gotama. Any fire burning dependent on a sustenance of grass and timber, being unnourished — from having consumed that sustenance and not being offered any other — is classified simply as 'out' (unbound)."
"Even so, Vaccha, any physical form by which one describing the Tathagata would describe him: That the Tathagata has abandoned, its root destroyed, made like a palmyra stump, deprived of the conditions of development, not destined for future arising. Freed from the classification of form, Vaccha, the Tathagata is deep, boundless, hard to fathom, like the sea. 'Reappears' doesn't apply. 'Does not reappear' doesn't apply. 'Both does & does not reappear' doesn't apply. 'Neither reappears nor does not reappear' doesn't apply.
The Moral of the Story
The same point is made in all these passages: don't become caught up in arguments about issues that can never be resolved. Questions about the origin of the Universe, the nature of the soul, and what it is like to be the Buddha, can never really be answered. Speculating about these questions is not the way to peace, to release, to Nibbana. Buddhist philosophy is very pragmatic: it is concerned with 'seeing things as they are'. The practice of meditation, along with the other elements of the Eightfold Path, is aimed at that direct understanding of the nature of things.