‘In the Zen tradition they say there is no such thing as “spiritual growth” anyway. In this moment you are exactly where you are at this moment. This moment is the only real moment. The only way you can talk about “spiritual growth” is to compare this real moment with memories of the past (which are often muddled and mistaken) or anticipation of the future (which is always muddled and mistaken). Comparing this real moment with memories of the past or anticipation of the future makes no sense.’ (from Hardcore Zen)
Recently, in a conversation among meditation teachers, I was glad to hear that no-one wanted to provide ‘advanced’ courses in meditation. There is just sitting; you can instruct people how to array themselves, techniques they can use, and what they might expect. That’s about it.