Sotapanna is said to have five spiritual characters: Saddha, Sila, Suta, Caga, and Paññā.
(1) Here, the Saddha I understood as : the unwavering confidence towards Buddha, Dhamma, and Sangha. But in what way it can be known as “unwavering confidence”?
Puthujjanas believe Dhamma either by “Amulika-Saddha (blind-faith)” or by “Akaravati-Saddha (reasoned-faith)”. Sotapannas believe Dhamma by “Acala-Saddha (unwavering-faith)”
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The “Amulika-Saddha” is not based on wisdom. It is based on some “other-thing”. When this “other-thing (the base for Saddha)” changes “Amulika-Saddha” changes.
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The “Akaravati-Saddha” is based on “inferential-wisdom”. This inferential-wisdom is unstable. When some strong opposite-causes are met, this inferential-wisdom changes. That means “the base for Saddha” changes. Then inevitably Saddha changes.
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“Acala-Saddhā” is based on “stable-wisdom”. This stable wisdom is gained by realizing Dhamma practically up to a certain degree. Even when strong opposite-causes are met, there is no possibility of a change in this stable-wisdom according to the Blessed One. If the “base for Saddhā” does not waver, then the Saddhā does not waver.
For example, both Mahayana and Theravada Buddhists, devoted and faithful to the Buddha Sakyamuni, are they the same in terms of gaining ‘unwavering confidence’?
(According to Theravada:) Any Non-Theravadin interpretation of Dhamma is not Dhamma. So they have faith in Non-Dhamma. It is not Buddhist Saddhā. By such a faith, no one can realize the Paticcasamuppada. They can not gain at least the “Refuge of Triple Gems (Tisarana/ Upāsaka-status)”, let alone Stream-entry.
(2) Sila here is Pancasila or Atthangasila?
Because there were many married Sotapannas, their permanent Sila can not be Atthangasila.
Can Sotāpanna unknowingly breaks the precepts?
Yes, but never intentionally. (according to the Vinaya)
(3) Suta is knowledge of the teaching. Is there any rule that how much needed to be learned ? Or just up to personal capacity?
No rule can be found. But it is implied that the more one learns the more he gains a support for wisdom.
(5) What is the exact difference between this Sotāpanna Paññā and later Arahant’s Paññā? What is the limitation of this Sotāpanna Paññā ?
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A Sotāpanna can’t see the drawbacks of Tanhā fully. An Arahant can see the drawbacks of Tanhā fully.
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A Sotāpanna can’t see the drawbacks of Avijjā fully. An Arahant can see the drawbacks of Avijjā fully.
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A Sotāpanna has understood the amount of truth necessary to stop the Samsāra within 7 life times. An Arahant has understood the amount of truth necessary to stop the Samsāra in this very life.
The surprising simile given to understand the difference between the results of their wisdoms:
If the size of whole suffering is “Earth+Nail”, then a Sotāpanna has liberated from the “Earth” while an Arahant has liberated from both “Earth” and “Nail”.
Nakhasikhāsutta
Then the Buddha, picking up a little bit of dirt under his fingernail, addressed the mendicants: “What do you think, mendicants? Which is more: the little bit of dirt under my fingernail, or this great earth?”
“Sir, the great earth is certainly more. The little bit of dirt under your fingernail is tiny. Compared to the great earth, it doesn’t count, there’s no comparison, it’s not worth a fraction.”
“In the same way, for a person with comprehension, a noble disciple accomplished in view, the suffering that’s over and done with is more, what’s left is tiny. Compared to the mass of suffering in the past that’s over and done with, it doesn’t count, there’s no comparison, it’s not worth a fraction, since there are at most seven more lives. Such a person truly understands about suffering, its origin, its cessation, and the path.
That’s why you should practice meditation …”