John Gill Commentary John 16:6

"But because I have spoken these things unto you, sorrow hath filled your heart." — John 16:6 (ASV)

But because I have said these things to you
Of being hated and persecuted by the Jews, of being put out of their synagogues, and of losing their lives; and particularly of his departure from them, or the loss of his bodily presence:

sorrow has filled your heart ;
sorrow for his absence so possessed their minds, seized on all the powers and faculties of their souls, and engrossed all their thoughts, that it never entered into the heart of any of them, to inquire about the place he was going to, or the state he should enter upon; which had they had any right notions of, would have greatly contributed to have abated their sorrow, quieted their minds, made them easy under, and reconciled them to, his departure from them.