In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through him all things were made; without him nothing was made that has been made. In him was life, and that life was the light of all mankind. The light shines in the darkness, and the darkness has not overcome it. (John 1:1-5)

The opening verses of the Book of John are among the most commonly cited scriptures in Christianity. They contain deeply significant content that underlines the importance of knowing the Word of God ('Word', or 'Bible').
2000 years ago, Apostle John - one of Jesus' 12 disciples and writer of 1John, 2John, 3John and the Book of Revelation - was used by God to write the above scriptures. Because God IS the Word, one must clearly know the Word in order to know God. Through this Word, everything about God is made known to us: His heart, character, painstaking 6000-year history, identity of the enemy, purpose for our individual life and His will to reclaim this world back to Him and live eternally with humanity in paradise. For those who desire God, what else could be more important than this?

In the above reference, John writes that nothing has been created without the Word. In other words, God's 6000-year work from (figurative) creation in Genesis through to the fulfilment of Revelation today is all contained within His Word. Everything that God considers of utmost importance for us to know is contained within His Word. Moreover, because this Word is life, it is also light that shines in the darkness of the religious world. When Jesus Christ came to his own people - the Jews of the 12 tribes of physical Israel - they refused to accept his teachings, but instead persecuted him and nailed him on a Cross. How will Christians respond today if and when Jesus Christ returns?

That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked at and our hands have touched - this we proclaim concerning the Word of life. The life appeared; we have seen it and testify to it, and we proclaim to you the eternal life, which was with the Father and has appeared to us. (1John 1:1-2)

As Jesus Christ was born of the seed of God, and so was the son of God (not God - see Isaiah 7:14), he is also the Word that became flesh. Jesus Christ was sent to the earth 2000 years ago to fulfil Old Testament prophecy. He received and ate the open scroll that had been shown to the prophet Ezekiel by God c.600BC by testifying to the fulfilment of the Old Testament prophecies (Ezekiel 3). As Jesus testified, God was with him (Matthew 3:16) and so every word Jesus spoke to the people concerned the word of God. Similarly, the one who received and ate the opened scroll in Revelation 10 is testifying to the fulfilment of the New Testament prophecies today. Jesus - who is also the Word - is with him. He is Jesus' promised messenger who testifies everything he has seen and heard concerning the physical fulfilment of Revelation to the churches in the world (Revelation 22:8,16).

Although God - the light, life, Creator and father of our spirits (Hebrews 12:9) - left this earth 6000 years ago, He has never given up on His creation but has been working without rest to reconnect the lifeline that was cut (John 5:17). When this is done, man will not live for 70/80 years but will receive eternal life which existed in the time of Adam at the beginning of the Bible. This is why we should always seek to have this light (Word) and God's promises contained in our hearts. This is the power of God and the power of the Word.

Main Reference
The Word in the Beginning
https://youtu.be/9TTZEDxsEEI