“Then do you mean to say, that a man learns the use of these || how to use these words & then for no earthly reason at intervals says them, || (just) says them, for no earthly reason?” – Exactly; there is no reason here of the kind you mean. (If you say the reason is that he has pain it is analogous to saying, || : “the reason why he says that

dx² dx

= 2x is that it is so.”) And you have to regard the utterance (without a reason) with the same respect as a statement that rests on a reason, not as something that lacks support.