If you want to understand the true meaning of life, if you seek to have eternal life, if you long to know God, you will find these desires fulfilled in the person of Jesus Christ as He is revealed in this gospel. The first 18 verses are more than just a prologue. These verses set the theme for the entire book. John is introducing us to his beloved friend, teacher, Savior and revealing Jesus' true identify to us. The faithful Jewish priests served in the temple day after day, but by the time of John, the glory of God was not felt or seen in the temple.
Galatians 4:4-5 - "But when the fullness of time came, God sent forth His son, born of woman, born under that law. So that He might redeem those who were under the law, that we might receive the adoption as sons." This is the right time for God's people.