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  • The_Savior_from_Spiritual_Error_and_50_Principles, page : 42

became clear to me that certain knowledge is so clear that it has no doubt
and that no errors or assumptions will be subject to it and that the heart
cannot even evaluate such a supposition. Certain knowledge must also be
infallible; and this infallibility or safety from error is such that no attempt to
show the falsity of the knowledge even if challenged by a person who turns
stones into gold or a rod into a serpent. This should not have any impact of
doubt on the reality.

And if I knew that ten is more than three and suppose someone told me,
“No, three is more than ten, and in proof of that I shall change this rod into a
serpent” and goes and does so and I see this for myself. I will doubt my
knowledge and all that I will have is a wonder as to how he was able to do
what he did. As for the doubt of what I knew, it will not happen.

After these reflections I knew that whatever I do not know in this fashion
and with this mode of certainty is not reliable and infallible knowledge; and
knowledge that is not infallible is not certain knowledge.