understanding, comprehension / appreciation

internal language

sooner or later / eventually / before long

inside, within (physical location) / between, among / while, during, inside or within a span of time / (when used possessively) one's own, my, our

natural language understanding

toilsome, painstaking / worrisome

toil, hardship / worry, anxiety

to toil, to work hard / to worry

understand, comprehend / appreciate

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you