The famous Zen parable about the master for whom, before his studies, mountains were only mountains, but during his studies mountains were no longer mountains, and afterward mountains were again mountains could be interpreted as an alleory about [the perpetual paradox that when one is closest to a destination one is also the farthest).
A man who lies to himself, and believes his own lies, becomes unable to recognize truth, either in himself or in anyone else, and he ends up losing respect for himself and for others. When he has no respect for anyone, he can no longer love, and in him, he yields to his impulses, indulges in the lowest form of pleasure, and behaves in the end like an animal in satisfying his vices.