If it does put difficulties in your way, then how will it be if you behold the Son of man ascending up to where he was before? This unfinished and ambiguous sentence and query have been variously interpreted.
Some have argued that our Lord here simply refers to the "resurrection;" that he told his hearers they would have an opportunity of observing that, after death, he would return to where he was before, that is, to the conditions of earthly life.
The striking antithesis between "descending from" and "ascending" almost compels the repudiation of this view. Did Christ, however, mean to ask them whether, under the new condition of things, all ground of offence would not be taken away?
or to imply that their faith would have to be put to a still greater strain, and that they would stumble at length irretrievably?