John Chrysostom
Observe how, after He had cautioned Peter, and as Elijah and Moses spoke with Him about His impending glory, the Father made His voice heard from heaven, alongside numerous miracles, with the resurrection approaching. For He had proclaimed that He would not remain in the grave for long, but would rise on the third day. Despite all these signs, they struggled to comprehend, experiencing deep sorrow, not merely a passing sadness. This occurred because the significance of His words had not yet been grasped.
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If they were unaware, why did they feel such distress? They knew He was destined to die, as they had heard about it frequently. Yet they lacked a clear understanding of what His death would truly entail, that it would be resolved swiftly and yield immense benefits, as well as what the resurrection truly meant. Ignorant of this, they were left in anguish.