What does it mean that Jesus' words are spirit and life?

In John 6:63, Jesus says, 'It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.' This declaration indicates that His teachings are not merely to be understood on a surface level but are deeply spiritual and transformative. The 'flesh' refers to the physical and worldly understanding that profits nothing in matters of salvation. In contrast, Christ's words impart spiritual truth and eternal life when understood through faith. This highlights the importance of spiritual discernment in grasping the life-giving essence of the Gospel, which is only accessible through the illuminating work of the Holy Spirit.