Exact process of remembering past lives

[zerotime]

It is. It's pubbe-nivāsanussati, knowledge of former abodes or lives; the first of the realisations which the Buddha had on the night of his enlightenment.

in the case of the Buddha's complete Enlightenment, sounds a very important part this:

"...a hundred, a thousand, a hundred thousand, many eons of cosmic contraction, many eons of cosmic expansion, many eons of cosmic contraction & expansion"

that depth is not available for the rest. Some people can review previous lives spontaneously or by accessing into rupa-loka or kamma-loka with manomaya-kaya although without requested high progress. Only to some limit.

I believe this issue appears inside the Dhamma teaching, about the different depth to remember previous lifes for Buddhas, arhants, etcetera. I cannot remember the source.

It seems there is relation between the progress and the depth of those skills.

[Sam Vara]

It is. It's pubbe-nivāsanussati, knowledge of former abodes or lives; the first of the realisations which the Buddha had on the night of his enlightenment.

in the case of the Buddha's complete Enlightenment, sounds a very important part this:

"...a hundred, a thousand, a hundred thousand, many eons of cosmic contraction, many eons of cosmic expansion, many eons of cosmic contraction & expansion"

that depth is not available for the rest. Some people can review previous lives spontaneously or by accessing into rupa-loka or kamma-loka with manomaya-kaya although without requested high progress. Only to some limit.

I believe this issue appears inside the Dhamma teaching, about the different depth to remember previous lifes for Buddhas, arhants, etcetera. I cannot remember the source.

It seems there is relation between the progress and the depth of those skills.

Yes, that makes sense to me.