In accordance with my understanding of the Buddha's teachings I offer the following:
First: if the bare insight thing is valid -- i.e. if it is possible to
go straight to Vipassana without going via Samatha -- then why
wouldn't everyone just do that? Insight is The Point, after all,
(isn't it?) so why waste time with what seems to be mere training
wheels?
This sutta seems to make an analogy similar to training wheels, while at the same time apparently saying that jhāna is required for enlightenment:
"I tell you, the ending of the mental fermentations depends on the first jhana... the second jhana... the third... the fourth... the dimension of the infinitude of space... the dimension of the infinitude of consciousness... the dimension of nothingness. I tell you, the ending of the mental fermentations depends on the dimension of neither perception nor non-perception...
"Suppose that an archer or archer's apprentice were to practice on a straw man or mound of clay, so that after a while he would become able to shoot long distances, to fire accurate shots in rapid succession, and to pierce great masses. In the same way, there is the case where a monk... enters & remains in the first jhana: rapture & pleasure born of seclusion, accompanied by directed thought & evaluation. He regards whatever phenomena there that are connected with form, feeling, perception, fabrications, & consciousness, as inconstant, stressful, a disease, a cancer, an arrow, painful, an affliction, alien, a disintegration, an emptiness, not-self. He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.' [1]
Second: OK, suppose access concentration or first jhana is necessary,
but is also sufficient a level of samadhi as preparation for
vipassana. Then, again, why would anyone then continue on to "samatha"
jhanas 2 through 4? My understanding is that while those jhanas may be
cool and blissful, not only are they not The Point, they carry the
danger of attachment. So why bother with them?
According to the Pasadika Sutta, Budhhist monks are 'attached' or 'addicted' to the jhānas, which "...conduce to utter unworldliness, to passionlessness, to cessation, to peace, to insight, to enlightenment, to Nibbana."
The text continues:
"If then it happens, Cunda, that Wanderers teaching other doctrines should declare : The Sakyan recluses live addicted and devoted to these four modes of pleasure, to them ye should answer Yea, Rightly would they be speaking of you, nor would they be misrepresenting you by what is not fact, by what does not exist." [2] {note: translation/grammar mistakes were left untouched}
Other Suttas in which there are apparently good reasons to think that jhāna is important are as follows:
- "...jhāna monks [i.e., monks who practice jhāna] are...amazing people, hard to find in the world, i.e., those who dwell touching the deathless element with the body."[3] {note: this seems to imply that jhāna is connected to the 'deathless element'.}
- In the Cula-hatthipadopama Sutta, the four jhānas are called 'footprint[s] of the Tathagata' [4] {note: the jhānas are said to be evidence that indicates a Buddha might be around; however, in the text, the Buddha cautions the questioner about drawing a definite conclusion until the reality itself, that is, the Buddha, is seen. It seems reasonable to identify this with The Dhamma or Unbinding itself.}
- At AN 4.123, jhāna is described as leading either to rebirth in heavenly realms or to Nibbāna. [5]
- Jhāna is often referred to as 'a pleasant abiding here and now.' E.g., here: [6] {note: this sutta also makes the point that although jhāna is a pleasant abiding, it should not be mistaken with 'purity'}
- The Buddha's last act before he died was to enter all of the attainments and he passed away directly after arising from the fourth jhāna. [7]
- Jhāna is called the 'highest gratification of feelings...[which is] freedom from affliction'; when one enters jhāna, "On such an occasion he does not choose for his own affliction, or for another's affliction, or for the affliction of both." It is further stated that for one who does not fully understand the gratification of feelings, fully understanding feelings or instructing others so that they would come to fully understand feelings is impossible. [MN 13, Bodhi, In the Buddha's Words (full citation later; also look here for an alternate translation]. {note: The full understanding of feelings is threefold: (1) the gratification; (2) the danger; (3) the escape. Implicitly, even the pleasant feelings of jhāna are dangerous and an escape from them should be sought. The escape is to remove desire for feelings, including, implicitly, the desire for fine-material feelings; i.e., jhāna.