John presents Jesus, not as a phantom emanation, but as the reality, transcending the shadows represented by the temporal physical life.
Even many extra-biblical sources such as Tacitus, Seconius, Justin Martyr, Pliny, and Josephus corroborate and validate the biblical accounts of Jesus.
John emphasizes the reality of Jesus as the Logos (a word revealing hidden thought), the manifestation of God in the flesh, emphasizing His preexistence and divinity.
The Colossian Christians were criticized by ascetics for the way they were keeping the Sabbath and holy days. Paul argues against a philosophy, not the law of God.
Jesus encouraged His disciples by promising to send the Holy Spirit to empower them for the challenges of the Christian life, making us sensitive to God.