Jhāna is
the 1st Mental Absorption!
Jhāna is
Pāli: In Sanskrit = Dhyāna, in Chinese = Chān, in Japanese =
Zen.

Preliminaries:
Purified
Morality => Clear Conscience, innocence and the mental elation thereof.
Guarding the Senses => Absence of Temptation, greed, desire,
and attraction.
Clear Comprehension => Acute Awareness and absolute and acute mental presence.
Contentment => Calm
and stilled satisfaction even with nothing. Joy and Happiness.
Mental Factors of Entry:
1:
Absence of any Urge of Desire.
2: Absence of any Aversion or Anger.
3: Absence of any Lethargy
and Laziness.
4: Absence of any Restlessness and Regret.
5: Absence of any Doubt
and Uncertainty.
1: Presence of Directed Thought.
2: Presence of Sustained Thinking.
3: Presence of Rapturous Joy.
4: Presence of Pleasurable Bliss.
5: Presence of Single-Pointed Focus.
Subjective Experience:
Intense
presence and awareness. Effortless, undistracted, and focused thinking.
Attention anchored even at ease at any chosen object. Mind is fixed
and unified.
Final end-result of chain of reasoning is always reached quickly
and successfully.
Body is without any pain and is felt like being a feather inside a big empty
silent hall.
There is joy, bliss and happiness mixed into solid calm just like a
smiling
mountain!

Stages:
1:
Directing (adverting to sign of serenity).
2: Attaining entrance and stabilizing that.
3: Prolonging
and controlling duration.
4: Emergence from absorption.
5: Reviewing (looking back on).
Grades:
I:
Access Concentration like in the neighbourhood and approaching (upacāra-samādhi).
II: Full Absorption Concentration fixed
and anchored on object (appanā-samādhi).
The
meditation techniques which can induce
Jhāna Absorption are:
Awareness
of Breathing (Ānāpānasati)
Basic Entirety Object (Kasina)
Inner Organs
and Corpses (Kāyagatāsati)
The 4 Infinite
and Divine States (brahma-vihāra)
The 4 Formless States (Āruppa)
Video on detailed explanation of
Ānāpānasati
breathing meditation:
https://www.youtube.com/watch?v=FZLud0Ue7LE
Manual:
The Path
of Purification: Visuddhimagga.
By the Great Explainer: Buddhaghosa. 5th century AC.
Ceylon.
https://what-buddha-said.net/library/pdfs/PathofPurification2011.pdf

Buddha
Said:
Having
momentarily eliminated the five mental hindrances of: Sense Desire, Ill Will,
Lethargy and Laziness, Restlessness and Regret, and Doubt and
Uncertainty, which all
are defiling imperfections of the mind that obstruct concentration
and understanding,
quite secluded from sensual pleasures, separated from disadvantageous mental
states,
one enters and dwells in the first Jhāna absorption of directed
and sustained
thought
joined with joy and pleasure born of secluded solitude. One makes this joy
and pleasure
born of secluded solitude pervade, perfuse and fill the entire body so that all parts is
thrilled
by this joy and pleasure born of secluded solitude. Even as a clever barber or
his apprentice would put
soap powder in a brass basin, sprinkle it with water, gradually
knead and moist it into a ball of
foam soaked thoroughly everywhere inside out yet
without dripping, so too
does he pervade, perfuse and fill his
entire body so that all
parts is
completely drenched with joy and pleasure born of secluded solitude.
More on
Jhāna absorption:
https://What-Buddha-Said.net/drops/Details_of_the_Jhana_Absorptions.htm
https://What-Buddha-Said.net/drops/Requisites_for_Jhana_Absorption.htm
https://What-Buddha-Said.net/drops/What_is_Right_Concentration.htm
https://What-Buddha-Said.net/drops/III/Concentration_Samadhi.htm
https://What-Buddha-Said.net/library/DPPN/wtb/g_m/jhaana.htm
https://What-Buddha-Said.net/drops/Samma-Samadhi.htm
