In the 1970s I learned from my Teacher (from the Gurdijeff lineage) that the law of three consisted of three forces (to which the you piece speaks):

1. Affirming (active force or principle)

2. Denying (receptive principle)

3. Reconciling (neutral force or principle)

I have utilized the law of three in all spiritual practices since the '70s.

For more on "The Law of Three" from a broader context: https://the-kai9.medium.com/the-law-of-three-a-primer-4b7533d015e9

Also how "The Law of Three" connects with the enneagram of process of completion: https://psychesweather.wordpress.com/2018/07/28/time-and-the-processes-of-time-through-the-enneagram/