The following is respectfully quoted from “Perfect Conduct” with commentary by Dudjom Rinpoche:
4.b.3(b.9) Doubting the Dharma:
The ninth is explained as doubting the innate purity and liberating nature of the foundation, path and result.
The foundation, path, result, and all meanings are explained as the natural, perfectly pure nondual clear light bodhicitta, which is the originally pure fundamental essence of the sugatas. To believe that this path of Dharma is merely meant to lead one to a happier state but does not have the ultimate potential to bring about full awareness of one’s buddha nature, and to then doubt it so that faith and confidence are lost, constitutes the ninth root downfall.
