What this quote means

Gide points out that the most common deceit is self-deception. We often lie to ourselves to protect our ego, avoid reality, or maintain comfortable illusions. This self-deception is insidious because it prevents true self-knowledge and growth. Lucidity toward oneself is an act of courage and the first step toward a more authentic life.

How to apply it daily

Reflect on a lie you tell yourself about yourself or your life. Write down the truth, even if it's hard to admit.