Caitlin says:

If you remember that the goal is to no longer be at the whim of preconditioned mental habits in perceiving the world, it’s easy to figure out what practices [e.g. mindfulness, self-inquiry, psychotherapy, among others she mentions] are useful toward that end by how acutely aware they make you of how little conscious control you have over your own inner processes.

So, not only do we know very little and control even less, Caitlin says we have little conscious control over our own inner processes. I assume she means what we think, how we think, what we take in and notice, what and how we interpret are outside of conscious control because:

You were born into a particular family with a particular worldview, you have a set of life experiences which shapes your ideology, and that ideology forms a perceptual filter through which you consume information. That filter dictates what your media consumption habits will look like, what you’ll take in as true, what you’ll reject as false, and what you’ll overlook or omit. You might get very lucky and coincidentally stumble into a worldview which happens to accurately reflect what’s going on in the actual world, but before long that world will change, and your habitual relationship with information will necessarily lead you and reality along diverging paths.

If you don’t have a finely tuned inner truth compass you won’t know where to push, where to pull, when to stop pulling and start pushing and vice versa, or where pushing or pulling would be a waste of energy.

Personally, I tend to be too sceptical of causes and initiative -- I need to change that thoughtfully.

To sum up, she says, “Don’t be doctrinaire.” about one’s positions in the activist world. Of course, don’t be overly sceptical about causes – something that I think I am.