instruct
誨 centers on giving instruction or teaching, especially through words or guidance.
誨 combines 言 (speech, words) with 每, which likely contributes the sound and may suggest repeated or careful instruction.
Words (言) beside 每: imagine a teacher repeating instructions every time (每) someone needs guidance.
For カイ, picture a wise guide named Kai who patiently instructs others: Kai -> カイ, and his words teach.