>How can one know that one has attained 1st. Jhana?
Thanx for a quite good core meditation question...
Answer: By carefully evaluating these criteria:
Absence of bodily pain.
Absence of sense desire.
_ _Absence of ill will.
_ _Absence of lethargy & laziness.
_ _Absence of restlessness & regret.
_ _Absence of doubt & uncertainty.
_ _Presence of directed thought.
Presence of sustained thinking.
Presence of thrilled joy.
Presence of pleasurable happiness.
Presence of unified single-pointed focus.
Maintenance of the state for > ~30 secs.