[sn9]

The karmic traditions developed this most completely and thoroughly. You don't need to buy into the supernatural claims to benefit from them.

A great starting point can be Shinzen Young's The Science of Enlightenment and/or Sam Harris's Waking Up.

After that, you might look into Why Buddhism is True or The Yoga Sutras of Patanjali or Mindfulness in Plain English.

The Healthy Gamer Youtube channel also has great videos going into this and how they tie into psychology.

David Chapman's https://meaningness.com/ is also pretty great.

[theaussiestew]

One doesn't need to distance themselves from the origins of all this literature on meditation and self-realisation. Taking only the scientific bits and discarding the rest is a very partial view.

[physicles]

You say “origins”, but someone who takes a more skeptical stance would say “extraordinary supernatural claims for which there’s no evidence at all.” In my case, I absolutely need to discard that stuff if I have any chance of taking what’s left seriously.

[pmarreck]

For people who chafe at anything remotely looking like "religion" or "spirituality," this is a valid way to try to get past the closed-mindedness