[33] "Who, venerable sir, makes contact?"
"Not a fitting question," the Blessed One said. "I do not say, 'one makes contact.' If I were to say, 'one makes contact,' then in that case this would be a fitting question: 'Who, venerable sir, makes contact?' But I do not speak thus. When I do not speak thus, if someone should ask me: 'With what as condition, venerable sir, is there contact (phassa)?' — that is a fitting question. And in that case the fitting answer is: 'With the six sense bases (saḷāyatana) as condition, there is contact; with contact as condition, there is feeling (vedanā).'"
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.