Then, when it was evening, Ven. Malunkyaputta arose from seclusion and went to the Blessed One. On arrival, having bowed down, he sat to one side. As he was sitting there he said to the Blessed One, "Lord, just now, as I was alone in seclusion, this train of thought arose in my awareness: 'These positions that are undeclared, set aside, discarded by the Blessed One... I don't approve, I don't accept that the Blessed One has not declared them to me. I'll go ask the Blessed One about this matter. If he declares to me that "The cosmos is eternal,"... or that "After death a Tathagata neither exists nor does not exist," then I will live the holy life under him. If he does not declare to me that "The cosmos is eternal,"... or that "After death a Tathagata neither exists nor does not exist," then I will renounce the training and return to the lower life.'
"Lord, if the Blessed One knows that 'The cosmos is eternal,' then may he declare to me that 'The cosmos is eternal.' If he knows that 'The cosmos is not eternal,' then may he declare to me that 'The cosmos is not eternal.' But if he doesn't know or see whether the cosmos is eternal or not eternal, then, in one who is unknowing & unseeing, the straightforward thing is to admit, 'I don't know. I don't see.'... If he doesn't know or see whether after death a Tathagata exists... does not exist... both exists & does not exist... neither exists nor does not exist,' then, in one who is unknowing & unseeing, the straightforward thing is to admit, 'I don't know. I don't see.'"