On some necessary prerequisites for a good understanding:
The problem of Buddhism, is that there is no Cārvāka (Lokāyata) litterature left.
How to convince an ingrained naturalist or empiricist, that there is something beyond the senses, the natural and the supernatural; as Buddha stated it so clearly.
As long as the naturalist and purely empiricist mind will prevail in some, there will be no possible understanding of what Buddhism is for them.
At best, they'll strip the all Teaching of what is not worldly - keep, and rely on the sectarian added suttas/sutras - and then make the "interpretation" of the latter, a philosophical "buddhistic" requirement; as cryptically as possible.
At best, they'll veer unconsciously, towards the Śramaṇic and Brāhmaṇic view of the āraṇyaka (forest) Vedic tradition, which thought that the Self was Knowledge.
That by which we see (form), that by which we hear (sound), that by which we perceive smells, that by which we utter speech, that by which we distinguish sweet and not sweet, and what comes from the heart and the mind, namely, perception, command, understanding, knowledge, wisdom, seeing, holding, thinking, considering, readiness (or suffering), remembering, conceiving, willing, breathing, loving, desiring?
All these are various names only of knowledge (the true Self).
And that Self, consisting of (knowledge), is Brahman, it is Indra, it is Pragapati.
All that, is led (produced) by knowledge (the Self).
It rests on knowledge (the Self). The world is led (produced) by knowledge (the Self). Knowledge is its cause.
The'll deny this Self, but they'll long for it.
Head upside down.
Mara's dream couldn't come out better.
In this world with its ..., Māras, ... in this population with its ascetics.... (AN 5.30).
We are all possessed - more or less.
And what, bhikkhu, is inward rottenness? Here someone is immoral, one of evil character, of impure and suspect behaviour, secretive in his acts, no ascetic though claiming to be one, not a celibate though claiming to be one, inwardly rotten, corrupt, depraved. This is called inward rottenness.”