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The past cannot be recalled, but the present is available. Uncertainty should not be grasped at.
The problem is usually grasping at an illusion of future certainty.
Ajahn Chah liked to say all things are impermanent and they are uncertain.
I'm assuming by "uncertain" he meant "empty".
Would that be correct?
Yes, everything that arises is uncertain because it depends on conditions, and conditions are continually changing. I think recognising uncertainty is a way of letting go, seeing the illusion of control.
when we grab (like) one, we reject (dislike) all other, in one thought moment
this is happening to us all the time, unless we are mindful with wisdom
Yes, the trick is realising that we don't have to follow through on all these craving and aversions, and they usually don't last that long.
We come into the conditioned from the unconditioned when born.
If an infant was taught Buddhism from birth or childhood before their minds get conditioned, would it be easier for them to understand the Dharma and reach Nirvana, since their minds would be more open? Nowadays children are conditioned to enjoy pretty much the same sense pleasures that adult’s desire (i.e. parents giving an IPad to their child before bed or to keep them silent). What if a child was taught the Dharma from birth with little distractions?
It's an interesting thought since Buddhist practice can be seen as a way of stepping outside our conditioning and habitual assumptions - including the Buddhist ones!
If you mean the four tetrads of anapanasati, there are quite a few different commentaries.
The most comprehensive commentary I have read is by Bhikkhu Buddhadasa: http://www.buddhanet.net/pdf_file/anapanasati.pdf