Thinking improves together.
An argument turns into collaboration the moment curiosity outranks ego. The people worth arguing with are the ones who leave your thinking sharper than they found it.
You can practice thinking alone, and you should. You cannot check it alone. The errors you are most likely to make are the ones you cannot see, which is the whole reason they are still there, and the only reliable detector for them is another mind that does not share your blind spots.
That is why the practical form of this article is a gathering: people in a room, or on a call, working through something together. Feeds and comment threads do not count. They reward the sharpest line, and the sharpest line is rarely the truest one. A gathering works when it is small enough that everyone can be wrong out loud and have it be fine.
Someone brings a question they are stuck on or a belief they have started to doubt. Sometimes they bring a thing they built. The rest of the room looks for the holes, out of curiosity rather than for sport. The rule from the manifesto applies: the point is to leave each other sharper, and the person who changes their mind in the room is the one who won.
This is the part of Novism that does not exist yet. The manifesto was the easy part. A gathering has to be started by someone, in a particular city, on a particular evening, and the signup on the front page is how you will hear when that happens.
VII. Understanding must become action.