I continue with the section from my book:
Difference between samatha and vipassana
The Visuddhimagga explains that one intent on development of samatha:
should sever any of the ten impediments that he may
have. A dwelling, family, and gain, A class, and building
too as fifth, And travel, kin, affliction, books, and supernormal powers: ten. Vism. III 29.
[…] Iddhi, here, means the supernormal powers of a
worldling. It is difficult to manage—like a child lying
on its back or like tender young crops. It can be broken
even by a small thing. However, it is an obstacle to
vipassanā (insight), though not to samādhi (concentration), because it is something attainable after attaining
concentration.
Therefore, for one intent on insight, the obstruction of
supernormal powers should be removed; for the other
[i.e., one aiming at concentration], it may be left as it is.
Vism. iii 56
This can help us see the different ways of insight and samatha.
For those who develop samatha superpowers are not an impediment as iddhi are a result of samatha. But all the other nine:
the ‘dwelling, family, and gain, a class, and building too as fifth,
And travel, kin, affliction, books’ are impediments. [Note, that
as I mentioned earlier the six recollections can be developed
in a busy daily life]. However, for the one who is developing
vipassana it is reversed, as the way of insight can be developed
even in the midst of all these nine. Why is it indicated that only
the iddhi are impediments to vipassana? It is because of their
fragility that one would have to be so careful to maintain them,
it distracts from the main goal.
Question: You say that vipassana can be developed in daily life. My
job is demanding and when I am trying to solve the issues
at work I am not thinking about Dhamma at all.
When we are fully preoccupied with worldly matters, as we
often are, at those times there is not development of intellectual
understanding (pariyatti). This is the way things are. Nevertheless, there may be opportunities that can arise naturally to
reflect on Dhamma or even have direct insight, if only for a few
moments. There may be some understanding of hardness or
that thinking goes on naturally by itself. These moments can
come unexpectedly.
Q: Shouldn’t we set aside quiet periods to devote to bhavana,
insight meditation.
Anytime we spend contemplating the Dhamma is beneficial. I
certainly appreciate those minutes and hours when I can read
a section of the Tipitaka or ponder at leisure the teachings.
We need to be careful though that we are not closing off the
possibility of understanding arising at other times. Also we
should be awake to the possibility of self-deception. If we don’t
have enough understanding at the level of pariyatti then what
we are calling ‘insight meditation’ might not qualify. And even
if we are well versed in the texts we should be patient and place
the principles of anatta to the fore: sati and wisdom don’t arise
at anyone’s will.