Final answer:
The phrase 'In the beginning was the Word' holds significance in both Christianity and philosophy, referring to the divine nature of Jesus and the rational principle underlying the universe.
Step-by-step explanation:
The phrase 'In the beginning was the Word' holds significance in both Christianity and philosophy. In Christianity, it is found in the opening verse of the Gospel of John and refers to the divine nature of Jesus Christ as the Word of God. The Greek concept of the 'logos' influenced the Christian understanding of Christ as the intermediary between God and the world. In philosophy, the term 'logos' was present in the teachings of Heraclitus and referred to the rational principle underlying the universe.