Heartfelt Desire, Heartfelt Wish
noun
The thing your heart requests is what your heart wants. This is your heartfelt desire. 心願 is often found in the phrase 心願成就 (fulfillment of a heartfelt wish), commonly used in the context of prayer rituals at Shinto shrines or Buddhist temples.
しんがん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
私はその神社で心願成就の御札を買いました。
I bought a charm at the shrine to help fulfill my heart’s desires.
このおまもりは、どのような心願も成就させる魔法のおまもりです。
This amulet has the magical power to fulfill any heartfelt wish.
このお寺では、毎日護摩を焚いて、人々の心願を祈願しています。
At this temple, they perform daily fire rituals called "goma" to pray for the fulfillment of people's heartfelt desires.