John 12:16

Jesus’ disciples did not realize all the implications of Jesus’ entry into Jerusalem at this time. After Jesus’ resurrection and ascension they did (cf. John 2:17; John 2:22). Obviously they and the crowd realized that Jesus was the Messiah, as they conceived of the Messiah. However they did not understand the nature of His messiahship, the necessity of His death, or the plan for His kingdom then. For example, they may have not understand the significance of His riding a donkey’s colt rather than a war-horse. John’s statement here helps the reader understand the difference between the disciples’ understanding and comments before the Cross and their conduct and teaching after that event.

"The Passion and the Resurrection were keys in unlocking the mystery of Jesus’ person." [Note: Tenney, "John," p. 127.]