I vow to ingest only items that preserve well-being, peace, and joy in my body and my consciousness... Practicing a diet is the essence of this precept. Wars and bombs are the products of our consciousness individually and collectively. Our collective consciousness has so much violence, fear, craving, and hatred in it, it can manifest in wars and bombs. The bombs are the product of our fear... Removing the bombs is not enough. Even if we could transport all the bombs to a distant planet, we would still not be safe, because the roots of the wars and the bombs are still intact in our collective consciousness. Transforming the toxins in our collective consciousness is the true way to uproot war (72-73).

If at some point in your life you adopt an idea or a perception as the absolute truth, you close the door of your mind. This is the end of seeking the truth. And not only do you no longer seek the truth, but even if the truth comes in person and knocks on your door, you refuse to open it.
Attachment to views, attachment to ideas, attachment to perceptions are the biggest obstacle to the truth.