But because I have said these things unto you, sorrow has filled your heart.
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Cornelius a Lapide
AD 1637
But because I have said these things to you, sorrow hath filled your heart.—Maldonatus explains "but" by "for," i.e, This (your sorrow) is the reason why ye ask Me not. But Toletus explains it by "Nay, rather," meaning "Ye not only do not ask Me, but more than this, ye are overwhelmed with sorrow." But it is simpler to understand as conveying a tacit reproof for being so given up to sorrow, as to have no courage to ask Him that which would have alleviated their sorrow, and would have been to them the greatest consolation and joy: namely, that He was going to the Father, and would send His Holy Spirit to prepare a place for them in heaven.
Sorrow hath filled your heart: and this sorrow hindereth you from asking, what you should earnestly desire to know. (Witham)
Peter had put the question above, chap. xiii. 36. and Thomas, chap. xiv. 5. But Jesus Christ means, that they did not persevere in their questions, so as to obtain satisfactory information, where, when, and for what end he was going, and how soon he was to return to them, or if to return at all. For it is customary with friends, to put the most minute questions on all these heads to friends, when they are about to be separated from each other. (Menochius)