You have already seen what inquiry is in essence: the careful, structured looking at your own experience to find out what is true.
Here, inquiry is taken up as one leg of the framework — what it requires, how to do it consistently, and what it produces in a mind that has been prepared by practice.
Inquiry is the most misunderstood leg.
You can study the Gita or Advaita Vedanta for twenty years and never do a single real inquiry. You can also do meaningful inquiry based on one well-framed question, without ever picking up a text.
Study and inquiry are not enemies. Study can frame the question. Texts preserve questions that have proven useful over time. A teacher can suggest where to look. But none of that is inquiry.
Inquiry is what you do, on your own experience, when you take a question seriously and keep looking until something clears.
In practice, inquiry looks like this.
You take one question. You stay with it.
For days. For weeks. You return to it in the morning. You bring it into quiet moments during the day. You let it touch the real material of your life: the moment you snapped at someone, the meeting you cannot stop replaying, the conversation that stirred something old.
You do not force an answer. You allow not-knowing.
Over weeks of returning to the same question with real experience in view, what feels obvious starts to shift. The thing that once seemed self-evident — I am this body. My anxiety is who I am. My story is me — slowly stops feeling so solid. Something behind it begins to come into view.
If you have never done inquiry deliberately, here is where to start.
Take the knower-known inquiry from earlier and do it properly.
Set aside fifteen minutes. Sit somewhere quiet. Without rushing, notice what is present — body, thoughts, emotions, sense of me — and place each in the known bucket. Then look, as honestly as you can, at the one who is doing the noticing and sorting. What can you say about it? What can you not say?
Stay with this longer than is comfortable. Do not rush to declare an insight. Whatever you find, even if it is mostly confusion, is your own finding.
Do this once a week for a month. Each time, the looking usually becomes a little sharper. What seemed obvious the first time can become less obvious the fourth time. That softening is the work.
When you are ready, pick another inquiry: into the nature of action, into where suffering actually lives, into the relationship between awareness and the world. Same approach: one question, real life material, slow sitting with not-knowing until something begins to open.
The relationship between practice and inquiry, simply stated.
Practice prepares the mind. Inquiry uses the prepared mind to see what is true.
Practice without inquiry brings relative peace, but not freedom. Inquiry without practice stays in the head and does not change the way you live.
Together, the two reinforce each other. Practice quiets the mind enough that seeing is possible. Seeing makes practice more wholehearted, because you now know from your own experience why it matters.
This is why all three legs — purpose, practice, inquiry — are needed. None alone is sufficient. Together, they make a path.