Tevijjasutta 1.15

1.15

‘Verily, Vāseṭṭha, that Brahmans versed in the Three Vedas should be able to show the way to a state of union with that which they do not know, neither have seen—such a condition of things can in no wise be!
‘Just, Vāseṭṭha, as when a string of blind men are clinging one to the other , neither can the foremost see, nor can the middle one see, nor can the hindmost see—just even so, methinks, Vāseṭṭha, is the talk of the Brahmans versed in the Three Vedas but blind talk: the first sees not, the middle one sees not, nor can the latest see. The talk then of these Brahmans versed in the Three Vedas turns out to be ridiculous, mere words, a vain and empty thing!’