We sleep every night and even during day time if and when required.
At that time we conserve energy and our brain regenerate, as per the version
of some Scientists .
While we sleep our brain loose certain things which we learnt every day.
But ”nerve cells” in the brain will grow fastly with some noise which are told as ”signals”
During such sleep, brain gets these signals and absorb these signals
our ancestors –Rishis –acharyars– knew this well and they prescribed ”santhai”
i.e. repeating twice what they preach —taught.
We can see in some northern States that Acharyals asked their sishyas to repeat what they said ”thrice”
With this method,our brain absorbs what we are asked to repeat like absorbing signals—–even during sleep.
But , if we say ”good-bye” to this brain memory and storage for certain time , this will disappear .
We have to renew this method often and often.
Our ancestors made compulsory the recital of ”Veda parayana”, ”Divya prabanda”
during uthsavams in the temples. By this parayanam i.e. recital — we cannot forget what we learnt by heart
from our Acharyals.
Not only for this but also for many teachings/ readings , this method of memorising is adopted
This may also be told as ”ASAI PODUTHAL” —cud–chewing by ruminants—- or
bringing to the mind again and again ,what we lerant—
But, Sri Kooraththaazhvan’s memory of ” Bothayana vruththi” is so exceptional