KanjiJLPT N1
Holy

holy, saint, sage, master, priest

Mnemonic

A Holy sage has an ear that hears whispers from heaven, a mouth that speaks only divine truths, and rules as the spiritual king over all who seek enlightenment. The ear catches what mortals miss, the mouth reveals what was hidden, and the king unites it all into Holy wisdom.
Additional thoughts
Picture a glowing sage on a golden throne: one ear tilted toward the sky catching celestial whispers, mouth open mid-chant, crowned as the spiritual king. Ear listens, mouth proclaims, king reigns — together they form holiness.
Quick recall
An ear for heaven, a mouth for sacred truth, a king of the spirit — that is holy.

Details

The keyword for 聖 is holy. This kanji conveys the concept of sacredness, spiritual purity, and divine wisdom. It is used to describe that which is revered as supremely virtuous or set apart from the ordinary, often referring to saints, sages, or sacred matters. In both religious and secular contexts, it carries a sense of the highest moral and spiritual authority.
On'yomi
せい、しょう
Kun'yomi
ひじり