Mendicants in general — no named individual, no location, no occasion is given
Form
A single prose declaration followed by a four-couplet verse restating the same point
Length
Under a minute to read
Pairing
First of a matched pair with Iti 17 — this discourse names the single most helpful interior factor for a trainee; Iti 17 names the single most helpful exterior one
Difficulty
★☆☆☆☆ — a compact claim about what most helps ordinary, unfinished practice
Why this discourse, sixteenth
This discourse turns from causes of bondage — ignorance, craving — to a practical question: given that a trainee has not yet achieved the goal, what single thing helps most? The answer offered here is entirely interior: a particular way of directing one’s own attention. Its twin, immediately following, will give the matching exterior answer.
Reading guide
Who is “a trainee”
The discourse specifies its subject carefully: “a trainee mendicant who hasn’t achieved their heart’s desire, but lives aspiring to the supreme sanctuary from the yoke.” This is someone still in training (sekha) — not a beginner necessarily, but anyone who has entered the path and is still working toward its final goal, as opposed to one who has already arrived. The phrase “supreme sanctuary from the yoke” names that goal itself: safety from what binds and drives a person onward against their own best interest.
“Interior factors”
The discourse opens by specifying its own scope: “Taking into account interior factors…” This is a discourse about what a person can cultivate within their own mind, as distinct from external supports like companionship, teaching, or community — the subject of the next discourse, Iti 17. Among everything interior, the claim is precise: nothing helps as much as rational application of mind.
Rational application of mind
The term translated “rational application of mind” (yoniso manasikāra) describes a specific skill: attending to experience in a way that traces things back to their root or origin, rather than reacting to appearances at face value. The discourse states its effect plainly: “A mendicant rationally applying the mind gives up the unskillful and develops the skillful.” The claim isn’t that this attention feels good or produces insight as a side effect; it is framed as the direct mechanism by which unskillful states are abandoned and skillful ones are built up.
The verse: the same claim, tightened
The verse compresses the prose into four lines and adds one further claim not explicit in the prose: “Striving rationally, a mendicant attains the end of suffering.” Where the prose speaks of giving up the unskillful and developing the skillful, the verse names the outcome those two processes are aimed at — not incremental improvement, but the full ending of suffering itself.
Its twin, immediately following
Iti 17 answers the identical question — what most helps a trainee — from the opposite direction, naming good friendship as the single most helpful exterior factor. Neither discourse claims its own factor is the only thing that matters; each is scoped explicitly to its own domain, interior or exterior. Read as a pair, they suggest a trainee’s progress depends on both what happens within the mind and who that mind is placed among.
Key terms
sekha — “trainee,” one who has entered the path but not yet reached its final goal; the discourse’s named subject.
yoniso manasikāra — “rational application of mind,” attention that traces experience back to its root rather than reacting to surface appearances; the discourse’s central interior factor.
“the supreme sanctuary from the yoke” — the discourse’s phrase for the trainee’s ultimate goal, safety from what binds and drives one onward.
interior factors — the discourse’s own stated scope, distinguishing it from the exterior factor named in its companion, Iti 17.
“gives up the unskillful and develops the skillful” — the discourse’s description of what rational application of mind directly accomplishes.
The text
The discourse in full. Translation: Bhikkhu Sujato (CC0, SuttaCentral).
§1This was said by the Buddha, the Perfected One: that is what I heard.
§2“Taking into account interior factors, mendicants, I do not see a single one that is so very helpful as rational application of mind for a trainee mendicant who hasn’t achieved their heart’s desire, but lives aspiring to the supreme sanctuary from the yoke. A mendicant rationally applying the mind gives up the unskillful and develops the skillful.”
The Buddha spoke this matter. On this it is said:
§3“There is nothing so helpful for a trainee mendicant aspiring for the ultimate goal as rational application of mind. Striving rationally, a mendicant attains the end of suffering.”
§4This too is a matter that was spoken by the Blessed One: that is what I heard.
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Self-check quiz
Ten questions. Click an answer to see immediate feedback. No score is recorded — this is for your own checking.
Question 1 of 10
What single interior factor does this discourse say is most helpful for a trainee mendicant?
Correct: C. “I do not see a single one that is so very helpful as rational application of mind.”
Question 2 of 10
Who exactly is the subject of this discourse?
Correct: B. The discourse specifies a “trainee” (sekha) still working toward the final goal.
Question 3 of 10
According to the discourse, what does a mendicant rationally applying the mind accomplish?
Correct: D. This is stated directly as the effect of rational application of mind.
Question 4 of 10
What outcome does the verse add that isn't made fully explicit in the prose statement?
Correct: A. The verse names the full ending of suffering as the outcome the two prose processes are aimed at.
Question 5 of 10
What scope does the discourse explicitly set for itself at its opening?
Correct: C. This scoping sets up the pairing with Iti 17, which addresses exterior factors.
Question 6 of 10
Which discourse forms this one's matched pair, and what does it address?
Correct: B. Iti 16 and Iti 17 answer the identical question from interior and exterior angles respectively.
Question 7 of 10
What does the phrase “the supreme sanctuary from the yoke” refer to?
Correct: D. This is the discourse’s own phrase for full liberation.
Question 8 of 10
Does this discourse name a specific place, audience member, or occasion?
Correct: A. No location or named individual appears anywhere in the text.
Question 9 of 10
What does the reading guide say “rational application of mind” (yoniso manasikāra) describes?
Correct: C. This is the reading guide's description of the term's meaning.
Question 10 of 10
How many lines does the verse restating the prose claim have?
Correct: B. A compact six-line verse, matching the shape used throughout much of this chapter.
