know seem to resist being used in imperative constructions. In particular, it does not seem possible to use them to command people to change their mind about what they want or to learn something.
A sentence like
*Want to eat. with the intended meaning similar to
You should want to eat. does not appear grammatical to me.
Similarly, a sentence like
*Know about the history of waffles. with an intended meaning similar to
Learn about the history of waffles. also does not appear grammatical to me. I can think of a handful of examples with
know in the imperative though:
know your limits,
know your place, &c.
Psych verbs like
think can be used to make commands.
Think about it some more.
How would one analyze this failure?
knowing are not thought of as volitional psychological states. However,
know at least does appear to have an imperative which can be used in a few cases.