We are not born to suffer, and despite the mind's addiction to darkness, the nagual in you is always seeking the light. If you can't find it on your own, life will create situations that will push you into the light. Life does so because you and life are one.
Yet even as we step into the light, there will be those who will tell us that we aren't good enough, we don't have power, or we should give up because it's too hard. While these voices may come from others around us, many times that story also comes from within.
In the Toltec tradition we call this voice, the one that spreads negativity in your mind, the parasite. The parasite is the voice in your mind that says you are not enough, you don't have the power, or you should stay in your cave and not even try to fly among the beautiful birds.
Think for a moment about any areas of your life where you have told yourself that you are "not enough." Where do you sell yourself short? Where are you afraid to pursue your dreams? Where do you say you are not good enough? That's the voice of your parasite speaking, not the nagual in you.
One lesson the story of Quetzalcoatl teaches is the importance of becoming aware of the parasite in your mind and the poisonous stories it spins. If we listen to the parasite and believe its lies without question, we will stay in our cave and never realize our potential, or we will remain snakes and never allow ourselves to fly among the birds.