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It means that no matter how powerful a Thunder Technique or any other spell might be, they are ultimately seen as Side Techniques or deviant practices. One should not pursue Side Techniques or deviant paths out of anger, vengeance, or a deliberate pursuit of power, for once you learn Thunder Techniques for these reasons, you could forget the original intention of your search for the Dao. In doing so, there might be a descent into wickedness.
These are also known as temptations of evil, inner demons, or becoming possessed by the devil.
Moving on:
To ensure that a cultivator does not succumb to sickness, old age, death, and suffering; to stand tall between heaven and earth; to shoulder the yin and embrace the yang, and to live as a human being, not as a ghost; among humans, one must cultivate towards immortality, and among immortals, ascend to the heavens!
