“We propose a general division of delusions;   “self deceptions of common feats" (like mysticism, erotomania, identity delusions, possession delusions, grandiose delusions) and "self deception of shield feats" (delusions of jealousy, delusions of reference as being slandered, persecution as being poisoned).  The theory of the shield feats can be the connecting piece between self deception and delusions, because although always delusions of grandiosity could easily be understood as self deception to enjoy a more pleasant world, the frequency of negative delusions seems to destroy this simplistic hypothesis. However , when considering the shield feats, then it is the link that connects the intuitive hypothesis of self-deception with psychosis , which happens to be understood as a continuum of the same phenomenon”