Reference for Yevamot 226:1

אי לאו דעתא צילותא ולעולם חדא דעתא הוא או דלמא פשיטא ליה דדעתיה קלישתא ולאו דעתא צילותא הוא והכא היינו טעמא כיון דעתים חלים ועתים שוטה

or not clear,<span class="x" onmousemove="('comment',' He cannot do anything rational. ');">¹</span> though [in either case] it Is always in the same condition,<span class="x" onmousemove="('comment',' Either always clear or always not clear. ');">²</span> or is it possible that he has no doubt that the [deaf man's] mind is feeble and that it is not clear,<span class="x" onmousemove="('comment',' He cannot do anything rational. ');">¹</span>

Jastrow