From the Ajaniya Sutta, we find that the ideal monk should be consummate in beauty, strength and speed (like a thoroughbred horse):
"In the same way, a monk endowed with these three qualities is worthy
of gifts, worthy of hospitality, worthy of offerings, worthy of
respect, an unexcelled field of merit for the world. Which three?
There is the case where a monk is consummate in beauty, consummate in
strength, and consummate in speed.
"And how is a monk consummate in beauty? There is the case where a
monk is virtuous. He dwells restrained in accordance with the
Patimokkha, consummate in his behavior & sphere of activity. He trains
himself, having undertaken the training rules, seeing danger in the
slightest fault. This is how a monk is consummate in beauty.
"And how is a monk consummate in strength? There is the case where a
monk keeps his persistence aroused for abandoning unskillful mental
qualities and taking on skillful mental qualities. He is steadfast,
solid in his effort, not shirking his duties with regard to skillful
mental qualities. This is how a monk is consummate in strength.
"And how is a monk consummate in speed? There is the case where a monk
discerns as it actually is present that 'This is stress.' He discerns
as it actually is present that 'This is the origination of stress.' He
discerns as it actually is present that 'This is the cessation of
stress.' He discerns as it actually is present that 'This is the path
of practice leading to the cessation of stress.' This is how a monk is
consummate in speed.
From the Akkhama Sutta, we find that the ideal monk should be resilient to sights, sounds, aromas, flavors and tactile sensations :
"In the same way, a monk endowed with five qualities is deserving of
gifts, deserving of hospitality, deserving of offerings, deserving of
respect, an unexcelled field of merit for the world. Which five? There
is the case where a monk is resilient to sights, resilient to sounds,
resilient to aromas, resilient to flavors, resilient to tactile
sensations.
"And how is a monk resilient to sights? There is the case where a
monk, on seeing a sight with the eye, feels no passion for a sight
that incites passion and can center his mind. This is how a monk is
resilient to sights.
"And how is a monk resilient to sounds? There is the case where a
monk, on hearing a sound with the ear, feels no passion for a sound
that incites passion and can center his mind. This is how a monk is
resilient to sounds.
"And how is a monk resilient to aromas? There is the case where a
monk, on smelling an aroma with the nose, feels no passion for an
aroma that incites passion and can center his mind. This is how a monk
is resilient to aromas.
"And how is a monk resilient to flavors? There is the case where a
monk, on tasting a flavor with the tongue, feels no passion for a
flavor that incites passion and can center his mind. This is how a
monk is resilient to flavors.
"And how is a monk resilient to tactile sensations? There is the case
where a monk, on touching a tactile sensation with the body, feels no
passion for a tactile sensation that incites passion and can center
his mind. This is how a monk is resilient to tactile sensations.
"Endowed with these five qualities, a monk is deserving of gifts,
deserving of hospitality, deserving of offerings, deserving of
respect, an unexcelled field of merit for the world."
The Sotar Sutta describes how an ideal monk should be a listener, a destroyer, a protector, an endurer and a goer.
"In the same way, a monk endowed with five qualities is deserving of
gifts, deserving of hospitality, deserving of offerings, deserving of
respect, an unexcelled field of merit for the world. Which five? There
is the case where a monk is a listener, a destroyer, a protector, an
endurer, and a goer.
"And how is a monk a listener? There is the case where, when the
Dhamma & Discipline declared by the Tathagata is being taught, a monk
pays attention, applies his whole mind, and lends ear to the Dhamma.
This is how a monk is a listener.
"And how is a monk a destroyer? There is the case where a monk does
not tolerate an arisen thought of sensuality. He abandons it, destroys
it, dispels it, & wipes it out of existence. He does not tolerate an
arisen thought of ill will... an arisen thought of cruelty... He does
not tolerate arisen evil, unskillful mental qualities. He abandons
them, destroys them, dispels them, & wipes them out of existence. This
is how a monk is a destroyer.
"And how is a monk a protector? There is the case where a monk, on
seeing a form with the eye, does not grasp at any theme or particulars
by which — if he were to dwell without restraint over the faculty of
the eye — evil, unskillful qualities such as greed or distress might
assail him. He practices with restraint. He guards the faculty of the
eye. He achieves restraint with regard to the faculty of the eye.
"On hearing a sound with the ear...
"On smelling an aroma with the nose...
"On tasting a flavor with the tongue...
"On touching a tactile sensation with the body...
"On cognizing an idea with the intellect, he does not grasp at any
theme or particulars by which — if he were to dwell without restraint
over the faculty of the intellect — evil, unskillful qualities such as
greed or distress might assail him. He practices with restraint. He
guards the faculty of the intellect. He achieves restraint with regard
to the faculty of the intellect.
"This is how a monk is a protector.
"And how is a monk an endurer? There is the case where a monk is
resilient to cold, heat, hunger, & thirst; the touch of flies,
mosquitoes, wind, sun, & reptiles; ill-spoken, unwelcome words &
bodily feelings that, when they arise, are painful, racking, sharp,
piercing, disagreeable, displeasing, & menacing to life. This is how a
monk is an endurer.
"And how is a monk a goer? There is the case where a monk goes right
away to that direction to which he has never been before in the course
of this long stretch of time — in other words, to the resolution of
all fabrications, the relinquishment of all acquisitions, the ending
of craving, dispassion, cessation, Unbinding. This is how a monk is a
goer.
"Endowed with these five qualities a monk is deserving of gifts,
deserving of hospitality, deserving of offerings, deserving of
respect, an unexcelled field of merit for the world."
The Ajanna Sutta states how an ideal monk should have eight qualities.
"In the same way, a monk endowed with eight qualities is worthy of
gifts, worthy of hospitality, worthy of offerings, worthy of respect,
an incomparable field of merit for the world. Which eight?
(1) "There is the case where a monk is virtuous. He dwells restrained
in accordance with the Patimokkha, consummate in his behavior & sphere
of activity. He trains himself, having undertaken the training rules,
seeing danger in the slightest faults.
(2) "When given food, whether coarse or refined, he eats it carefully,
without complaining.
(3) "He feels disgust at bodily misconduct, verbal misconduct, mental
misconduct, at the development of evil, unskillful [mental] qualities.
(4) "He is composed & easy to live with, and doesn't harass the other
monks.
(5) "Whatever tricks or deceits or wiles or subterfuges he has, he
shows them as they actually are to the Teacher or to his knowledgeable
companions in the holy life, so that the Teacher or his knowledgeable
companions in the holy life can try to straighten them out.
(6) "When in training he gives rise to the thought, 'Whether the other
monks want to train or not, I'll train here.'
(7) "When going, he goes the straight path; here the straight path is
this: right view, right resolve, right speech, right action, right
livelihood, right effort, right mindfulness, right concentration.
(8) "He dwells with his persistence aroused, [thinking,] 'Gladly would
I let the flesh & blood in my body dry up, leaving just the skin,
tendons, & bones, but if I have not attained what can be reached
through human steadfastness, human persistence, human striving, there
will be no relaxing my persistence.'"
"Endowed with these eight qualities, a monk is worthy of gifts, worthy
of hospitality, worthy of offerings, worthy of respect, an
incomparable field of merit for the world."