Cittas cannot arise together in same person. if an arising citta does not pass away, a new citta cannot born.
This is real-life. You can see it, if you are buddha or one of budda's students.
One citta can only be in one state: wholesome, unwholesome, or ineffective.
If a wholesome citta is not arising, than maybe an unwholesome citta is arising. Sīla and jhāna will prepare cittas so that they may arise as wholesome, continuously, enough to think in vipassanā-meditation, without any unwholesome citta arising during that vipassanā-meditation.
Why is vipassanā-meditation contrary to unwholesome cittas?
Because they, ie unwholesome-cittas, makes wholesome cittas weaker. Magga-cita is the most strong of all of the wholesome cittas. Meditators can not reach magga-citta, if they can not develop wholesome citta strongly.
It looks like weight training. If you use your time to eat instead of training, your muscles will not develop. They will not become stronger.
So it is a war to usurp arising. Sīla is the most powerful munition to fight with now-unwholesome citta, that make bad bodily actions. Jhāna is the most powerful munition to fight with now-unwholesome citta, that do not make bad bodily actions.
With these two: sīla & jhāna, meditators will not have unwholesome citta. So vipassanā-meditation can develop after unwholesome cittas have already stopped.
Read netti desanāhāravibhaṅga for more detail.
This is real-life. You can see it, if you are buddha or one of budda's students.
One citta can only be in one state: wholesome, unwholesome, or ineffective.
If a wholesome citta is not arising, than maybe an unwholesome citta is arising. Sīla and jhāna will prepare cittas so that they may arise as wholesome, continuously, enough to think in vipassanā-meditation, without any unwholesome citta arising during that vipassanā-meditation.
Why is vipassanā-meditation contrary to unwholesome cittas?
Because they, ie unwholesome-cittas, makes wholesome cittas weaker. Magga-cita is the most strong of all of the wholesome cittas. Meditators can not reach magga-citta, if they can not develop wholesome citta strongly.
It looks like weight training. If you use your time to eat instead of training, your muscles will not develop. They will not become stronger.
So it is a war to usurp arising. Sīla is the most powerful munition to fight with now-unwholesome citta, that make bad bodily actions. Jhāna is the most powerful munition to fight with now-unwholesome citta, that do not make bad bodily actions.
With these two: sīla & jhāna, meditators will not have unwholesome citta. So vipassanā-meditation can develop after unwholesome cittas have already stopped.
Read netti desanāhāravibhaṅga for more detail.