"We have clouded over our pure, God-given souls with negative thoughts. We have generated negative vibrations such as grudges, envy and hatred, and have thus polluted the souls of others as well as our own. This is explained by the fact that vibrations generated by negative thoughts reverberate like echoes and return to us. In the teachings, this phenomenon is referred to as “the principle of echo”. In accordance with this principle, people today are causing harm to their souls with their own negative vibrations."