We don't see this easily. There were the disciples. The Lord Jesus Christ had been crucified, but he was risen again and he now appeared to them and they couldn't understand this. There wasn't just the problem of believing that the Lord had risen from the dead. There was something else that made it all so hard to take in. Why ever would he do such a thing? Here he was, healing the sick, and raising the dead. He had attracted phenomenal attention, and the crowds followed him everywhere. Then all of a sudden he allows himself to be taken in apparent weakness and arrested when they knew he had the power to resist it easily. They had seen him do it before. They had seen people come to seek to arrest Christ and seize him violently and yet somehow he had exerted some amazing invisible power and nobody had been able to lay hands on him. He had the divine power to protect himself, yet he had allowed himself to be taken and crucified, slain, buried, and now he is appearing to them. But what is the point? That's what they couldn't understand. Yet Christ had explained what he was going to do. He had explained that the greatest need was not to reign over Israel as an earthly king. The greatest need wasn’t to reform the national worship and to set up the temple again and to throw out the hypocritical chief priests. The greatest need was to fulfil the predictions of the Scripture as the Messiah, as the Saviour; to come into this world and to suffer and die, to make an atonement, to pay the price of sin for all those who came to him, to take the punishment himself.
How wonderful to have one with perfect understanding to teach them! They could receive all that he said, knowing that it was perfectly explained, and that their teacher not only fully understood what he was teaching them, but he fully understood how their minds would process his words and grasp their meaning. He worked outside and inside at the same time. We do not have teachers with perfect understanding, but we have those who hopefully have given their lives to the study of Scripture. And we have the Holy Spirit who reads our hearts and knows what we grasp and what we fail to grasp, and who is able to enlighten our minds.
To have understanding of the Scriptures is so much more important than to have understanding of anything else. Many have lived and died with little understanding of how the cell works, how sound waves are transmitted, or of the principles of economics or law, but to be without understanding of Scripture is much more serious. God has put everything that we need to know for our eternal good in the Scriptures.