Namaskar to all
Is it generally accepted that mantras, when recited, are (at least in the initial stages of japa) understood to first "cleanse" a person karmically, by way of making the reciter undergo some kind of suffering/pain/grief and the like?
An acquaintance of mine, an upasaka in the Sri Vidya tradition, told me that chanting the mantras of the Devi generally result in some karmic 'detrimental' effects, by way of the surfacing of some kind of impediments or suffering in the reciter's life. This, he told me, is understood in the tradition as follows: the suffering that surfaces is a relatively less intense way of experiencing (and thus exhausting) the effects of bad karma that has lain in one's store.
I have heard somewhat similar statements from a few other reciters (belonging to various other traditions, with their practice consisting of reciting different mantras specific to their line). Many traditions - regardless of the devata or form of Iswara - seem to takes this standpoint - that the mantras "throw up" some karmic "effects" initially.
This standpoint seems to be at variance with the standpoint of the Smritis and the Sruti - Mantra Samhita and Brahmanas plus the Upanisads (specifically the saguna upasana / brahma vidya segments), which show a positive path devoid of suffering.
Such is the promise that the Agamas hold as well. The tantra traditions are unanimous in holding that they are eminently suited as the path that unites or harmonizes bhukti (experience) and mukti (liberation).
The Yoga tradition and the Dharmasastras praise the japa of Pranava (Om), practice of Tapas, Pranayama, and (various) dharanas/dhyanas as eminently destructive of sins (bad karma). Again, it is also unanimously held by the Sruti, Agama and Smriti that the ultimate incinerator of karma, both good and bad, is jnana (knowledge).
Taking the Brahma Sutras as an exemplar of the traditional line, the possible effects are understood to be broadly tripartite:
(a) Duritaksaya, i.e., reduction of the bad (sufferings/grief, etc)
(b) Aiswaryaprapti, i.e., obtention of the good (various benefits)
(c) Kramamukti, i.e., release by stages (mukti/moksa)
Now, if bad karma or sins are reduced/'burnt away' by japam, tapas and yogabhyasa, then it is reasonable to consider that mantra and pranayama etc overwhelm or overpower bad karma. If that is the case, how is it that mantra japa could lead to the surfacing of any kind of suffering, as many hold today (as detailed earlier)?
Is it that reduction or destruction or burning away of sins/bad karma essentially means their experience in lesser, milder, less intense forms and not their literal eradication/obliteration?
I would be thankful for any guidance on this point from knowledgeable members.