I hear you ask: One moment, isn’t ki the future tense prefix? Yes, it is. It however also is the word for to know. I am not sure what I drank when I created that (I was not almost-complete abstinent at that time) but there is a chance that it was related to the idea (stemming from having to memorize too much stuff I’d never need*) that knowledge is only relevant when it can relate to the future in some way, when it can be used.
Ki’tan is knowledge. Ki’he is someone who knows, ki’het is something which is known.
Example: Il’ki’ki sijehi. (2S-FUT-know tomorrow)
* it holds true so far for the things I considered unnessecary.