This is an extract from AN 10.22
"Whatever things, Ananda, conduce to realizing the truth of this or that
statement of doctrine, confidently do I claim, after thorough comprehension
of it, to teach dhamma about them in such a way that, when proficient, a man
shall know of the real that it is, of the unreal that it is not; of the mean
that it is mean, of the exalted that it is exalted; of that which has
something beyond it, that it has something beyond it; of that which is
unsurpassed, that it is unsurpassed.
For there is the possibility of his knowing or seeing or realizing that
which can be known, seen or realized. This, Ananda, is knowledge
unsurpassable, the knowledge of this or that thing as it really is. Than
this knowledge, Ananda, there is no other knowledge surpassing it or more
excellent, I declare."
[ PTS Gradual Sayings, Vol. V, page 26, translated by F.L. Woodward.]