Here the "light" is a metaphor for the revelation that comes from God. AT: "I am the one who gives light to the world" (See: [[rc://en/ta/man/translate/figs-metaphor]])
To "walk in darkness" is a metaphor for living a sinful life. AT: "will not live as if he were in the darkness of sin" (See: [[rc://en/ta/man/translate/figs-metaphor]])
# light of life
The "light of life" is a metaphor for the truth from God that gives spiritual life. AT: "truth that brings eternal life" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The Pharisees are implying that the witness of only one person is not true because it cannot be verified. AT: "you cannot be your own witness" or "what you say about yourself may not be true" (See: [[rc://en/ta/man/translate/figs-explicit]])