Suppose you have a black box. It has two openings, one labeled "Questions" the other labeled "Answers."
No matter what you put into the "Questions" slot, something will come out of of the "Answers" slot. Whatever the "Answers" output is, it is a complete answer to the "Questions" input question.
This is true even if the "Questions" input is not a question. To be clear, anything can be put into the "Questions" slot and will produce a complete answer from the "Answers" slot.
This means that even output from the "Answers" slot could be input into the "Questions" slot, and thereby produce it's own answer.
Again the truth of these answers will always be as reliable as the truth of the answer to the question "If I have one apple and someone else gives me an apple, how many apples will I have?" is "Two apples."
This is even true of questions that are unanswerable, like the halting problem or something of that nature. The black box will never the less produce an answer. The black box is not a computer and is not limited by the limits of computation.
Now, imagine that you do not have access to the "Answers" slot. The answers are being produced to whatever question you are feeding into it, but you cannot see them or know what they are.
That would be frustrating, but you would know for certain that there was an answer, even if you could not see it.
Suppose now, that for some questions, you can figure out the answer yourself. Without observing what the output of the black box is, you can still know what the box will output anyway. This empirical or grammatical fact. Things that can be known through observation or reason.
We have access to these facts, although the black box will not confirm them.
There are other questions that we cannot figure out the answers on our own. Any number of answers could be correct, all of them could be, or none of them could be. We just can't tell because we can't see what the output is.
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