sacca-ñāṇa: 'knowledge of the truth' (s. prec.), may be of 2 kinds: (1) knowledge consisting in understanding (anubodha-ñāṇa) and (2) knowledge consisting in penetration (paṭivedha-ñāṇa), i.e. realization. Cf. pariyatti .

"Amongst these, (1) 'knowledge consisting in understanding' is mundane (lokiya, q.v.), and its arising with regard to the extinction of suffering, and to the path, is due to hearsay etc. (therefore not due to one's realization of the supermundane path; s. ariya-puggala) (2) 'Knowledge consisting in penetration', however, is supermundane (lokuttara), with the extinction of suffering (= Nibbāna) as object, it penetrates with its functions the 4 truths (in one and the same moment), as it is said (S. LVI, 30): whosoever, o monks, understands suffering, he also understands the origin of suffering, the extinction of suffering, and the path leading to the extinction of suffering' " (Vis.M. XVI, 84). See visuddhi (end of article).

 "Of the mundane kinds of knowledge, however, the knowledge of suffering by which (various) prejudices are overcome, dispels the personality-belief (sakkāya-diṭṭhi, s. diṭṭhi). The knowledge of the origin of suffering dispels the annihilation-view (uccheda-diṭṭhi, s. diṭṭhi); the knowledge of extinction of suffering, the eternity-view (sassata-diṭṭhi, s. diṭṭhi); the knowledge of the path, the view of inefficacy of action (akiriyadiṭṭhi, s. diṭṭhi)" (Vis.M. XVI, 85).

Buddhist Dictionary, Manual of Buddhist Terms and Doctrines, by NYANATILOKA MAHATHERA