The Great Commission
Jesus had several times attempted to open the future to His disciples, but they had not cared to think about what He said. Because of this His death had come to them as a surprise; and afterward, as they reviewed the past and saw the result of their unbelief, they were filled with sorrow. When Christ was crucified, they did not believe that He would rise. He had stated plainly that He was to rise on the third day, but they were perplexed to know what He meant. This lack of comprehension left them at the time of His death in utter hopelessness. They were bitterly disappointed. Their faith did not penetrate beyond the shadow that Satan had cast athwart their horizon. All seemed vague and mysterious to them. If they had believed the Saviour's words, how much sorrow they might have been spared!
Crushed by despondency, grief, and despair, the disciples met together in the upper chamber, and closed and fastened the doors, fearing that the fate of their beloved Teacher might be theirs. It was here that the Saviour, after His resurrection, appeared to them.
For forty days Christ remained on the earth, preparing the disciples for the work before them and explaining that which heretofore they had been unable to comprehend. He spoke of the prophecies concerning His advent, His rejection by the Jews, and His death, showing that every specification of these prophecies had been fulfilled. He told them that they were to regard this fulfillment of prophecy as an assurance of the power that would attend them in their future labors. "Then opened He their understanding," we read, "that they might understand the Scriptures, and said unto them, Thus it is written, and thus it behooved Christ to suffer, and to rise from the dead the third day: and that repentance and remission of sins should be preached in His name among all nations, beginning at Jerusalem." And He added, "Ye are witnesses of these things." Luke 24:45-48.
During these days that Christ spent with His disciples, they gained a new experience. As they heard their beloved Master explaining the Scriptures in the light of all that had happened, their faith in Him was fully established. They reached the place where they could say, "I know whom I have believed." 2 Timothy 1:12. They began to realize the nature and extent of their work, to see that they were to proclaim to the world the truths entrusted to them.
AA 25, 26