The most repeated instruction he gives
Somewhere in the first week, most people start wanting the sit to go well. To go deeper than yesterday. To finally get somewhere. Campbell returns to this more often than to anything else, and his phrasing does not leave much room: this is most important — have absolutely no expectations and no specific goals.
He extends it to results. Do not pursue or chase after specific or general results. All results must come to you. If you go after them, it will only delay your progress. And to comparison: let every meditation be a new and unique experience, rather than forcing each one to resemble a previous one you judged to be good.
This is not spiritual decoration. It comes out of the laboratory. Describing the first binaural-beat workshop, he notes that they expected twenty naive subjects and planned to keep them that way by telling them nothing, because they did not want to lead anyone's reactions by giving them expectations.
There is a reason it matters beyond good method. The My Big TOE material puts expectation on a list with ego and belief as one of the ways fear expresses itself — the register being I need, I want, I believe, I expect, I deserve. Which puts a meditation done in hope of a result in an awkward position with respect to the thing it is supposedly reducing.
It is also why this app has no streak, no score and no badge, and why nothing here predicts what a session will feel like.
The instruction is his own words; the placement of expectation alongside ego and belief is from the project's glossary.
My Big TOE, Book 1, Chapter 23; My Big TOE glossary: Fear(opens in a new tab)