On the surface, this statement suggests that the ego, our sense of self, acts as a shield. It's a mechanism we employ to protect ourselves from perceived harm or discomfort. When we feel threatened, criticized, or inadequate, the ego constructs a narrative or a persona to defend its perceived vulnerability.

From the perspective of modern non-dual teachings, as articulated by Eckhart Tolle in 'The Power of Now,' this defense mechanism is not just a psychological habit but a fundamental illusion. The ego is identified with the thinking mind, a construct of past experiences and future anxieties, which falsely believes itself to be a separate, isolated entity. This perceived separation is the root of fear. The ego's 'defenses' are therefore attempts to protect a non-existent self, perpetuating the cycle of suffering. Tolle emphasizes that the ego is not inherently bad, but rather a misidentification with form and thought. True freedom arises when you recognize the ego's nature as a defense against the awareness of your true, formless Being, which is inherently peaceful and complete.

In your life: Notice when you feel a strong emotional reaction to an external event. Ask yourself if this reaction is the ego defending its perceived identity, and try to observe it without judgment.