This is important -- let it be. But what is 'It' when it just
'Be'/'Is'? As Thusness asked four years ago, "When things
are "be"? What is it? 
" 'It' is not anger, not 'bad emotions', -- not
anything that mind interpretes it to be -- it is just a pure
presence. Pure presence is all there is.
Our entire experience of the world and of ourselves is coloured
by our conditionings... we interprete our experience according to
what we have learnt or been taught from others. Prior to the mental
conditioning, what is It?
To truly let things be, we become completely alive to what
things truly are free from that layer of conditionings.
it means pure presence, but it does not make sense, if you
assemble this together, let pure presence be, i don't understand
what's does this mean, i think it could mean anything, since let it
be, is universally adopted, include emotion, good or ill emotion,
delusion.
After you stoping trying to control it, it will subdue and
reside in peace.
let it be, no action or no interference is little mantra, little
reminder of the right path, when you dealing with daily life.
Different meaning may be attached to it.
My understand of conditioning, is people is result of
accumulation of 业，so the condition does not mean mental
condition only.
I guess, prior to mental condition, which here means knowledge
occupied in your mind.It's the emptiness, which is the pure
presence you called, the true buddhaness of human