Adam Clarke on Acts 20:25

Ye all - shall see my face no more - This probably refers simply to the persons who were now present; concerning whom he might have had a Divine intimation, that they should not be found in life when he should come that way again. Or it may refer only to Ephesus and Miletus. From the dangers to which he was exposed, it was, humanly speaking, unlikely that he should ever return; and this may be all that is implied: but that he did revisit those parts, though probably not Miletus or Ephesus, appears likely from Phi 1:25-27; Phi 2:24; Plm 1:22; Heb 13:19-23. But in all these places he speaks with a measure of uncertainty: he had not an absolute evidence that he should not return; but, in his own mind, it was a matter of uncertainty. The Holy Spirit did not think proper to give him a direct revelation on this point.