Here is the source for that disclaimer of Buddha.
http://www.insidebuddhism.com/buddha/quotes.asp
Believe nothing. No matter where you read it, Or who said it, Even if I have said it, Unless it agrees with your own reason And your own common sense.
If memory serves me correctly, that is the similar text Ryokan referred me to in our first contact.
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About the no-soul and no-self, as I said there is no need for Buddhism to be operable to postulate such negative concepts; Buddhism can work perfectly even with the soul and the self intact, as every ordinary person into religion takes them for granted.
Maybe we have to search for the psychological motivation why Buddhism as portrayed in the ancient writings which only came up some more than 400 years after Buddha's death, and it is the yen to be different.
You start a religion to gather people to follow you, what do you do? For example, in another area of human endeavors, to get people to patronize your products in the market, e.g., another shampoo, what do you tell people about your shampoo to make them at least curious to try it?
You can make your shampoo exactly the same as one already very much sought after in the market, and tell people it is exactly the same except for the name, but you lower the cost.
Or you can tell them it is possessed of different even opposite features which vouch for its being better.
Yrreg