ichidan verb, transitive verb
make someone realize; bring home to someone; teach someone a lesson
Used when someone is forced to understand an unpleasant truth, often through experience or consequences. The subject is typically the situation or the person delivering the lesson.
彼の失敗は、準備の大切さを思い知らせた。
His failure made him realize the importance of preparation.
この経
This experience will bring him face to face with reality.