Feeling Poured Into an Action
を込めて says an action was done with a particular emotion put into it.
- 心を込めて作りました。(I made it with all my heart.)
It Only Takes Emotions
The noun before it must be a feeling or something feeling-like: 心, 愛, 感謝, 祈り, 願い, 怒り.
Concrete nouns do not work: ×砂糖を込めて. For putting a physical thing in, use 入れる.
を込めた Before a Noun
- 感謝を込めた手紙(a letter written with gratitude)
Where You Meet It
Gift cards, speeches, product copy and song lyrics. It is warm rather than formal, and it appears constantly on packaging — 真心を込めて is close to a fixed phrase in Japanese marketing.
