Chamtrul Rinpoche

 Emptiness is your ultimate protection against all enemies, both internal and external, and against the suffering that they inflict.

No matter how many enemies that you experience, no matter who or what they are, whether they are other beings, or an environment, or an afflictive emotion, or an illness, or whatever, not one of them truly exists without being dependent upon your mind's internal enemy.

For as long as your mind ignorantly grasps at an inherently existent 'self', there will always be an inherently existent 'other', and therefore you will always ignorantly perceive truly existent enemies, and you will suffer accordingly.

The moment that your mind is rid of this ignorance, by instead perceiving the reality of the emptiness of self, in other words, the lack of an inherently existent self, all internal and external enemies will disappear, and no matter what you encounter, you will always experience the pure bliss of reality.