Not all thoughts can be categorised in that specific way. Ajahn Succito was a Theravada monk, so it is highly likely that he was referring to something called conceit, of which there are nine types, the theme of which revolves around measuring and comparing.
Conceit in Theravada terms has a very specific outline and very specific details that define that outline. In that typified Theravada view - where various movements of the mind are fragmented into a ridiculous procession of elements, units and items to be known, discerned or observed - one monitors how that phenomena arises, abides and wanes out of existence – in this case, the way in which conceit manifests.
If Ajhan Succito was indeed speaking about conceit, then please read Theravada’s – very detailed – description of conceit from another Theravada monk called Yuttadhammo here, who delivers its seeming complexity rather simply. He also includes two excellent excerpts by Mahasi Sayadaw to help drive the point home. That might clear things up, a little.
So, yes, in Theravada, there is always something missing in what they have to say! They paint a rich tapestry of mind movements for those who are inclined to observe in that particular way.
Now, in my typified manner, I can’t help but include the illogical logic of Zen. It is from the perspective of Zen that other interesting vistas will show themselves, perhaps sometimes reflected as if from a sphere whereupon one is presented with a 360 degree view of the once-famed dire situation we call samsara, which is actually heaven on earth.
On that note, Zen master Dogan said -
Although its light is wide and great, the Moon is reflected in a puddle one inch wide. The whole Moon and the entire sky is reflected
in one dew drop on the grass.
Following on from your question, (which might be about conceit) Dogen he also said –
“To enter the Buddha Way is to stop discriminating between good and
evil and to cast aside the mind that says this is good and that is
bad.”
