Dear Piya,

> In the course of learning meditation, I have often heard the analogy of sawing, that
> is watching the point of sawing and not watching the saw.
>
> Is this from the Visuddhimagga or is it a meditation saw (pun intended).

It is a simile from Patisambhidamagga I,171, which is also given in
Vimuttimagga and Visuddhimagga.

In Dhamma, Dmytro