“Light” and “darkness” are paralleled by “truth” and “lying or deception” in this passage. The truth as a concept here is multi-layered It is in some places the truth about God. In other places it is truth about ourselves.
Ironically, we ourselves are often both the deceived and the deceiver at the same time. In such situations, we position ourselves in the darkness where we will be at risk of still further self-deception and further loss of joy. Self-deception is a self-perpetuating state of existence (2 Corinthians 4:4). Escape comes from abandoning the “self” and utterly surrendering to God, who is in Christ the Light of life, the Light of the world (Isaiah 9:1 & 2; John 1:4, 5, & 9; John 3:19-21; John 8:12; 2 Corinthians 4:6).
- Confessing Sin the Key to Vertical & Horizontal Fellowship (christianitymatters.com)