JLPT N3 Grammar: 込めて／込めた (How to say "with / full of (feeling)" in Japanese)

The video begins with a personal story about writing a letter to express gratitude, followed by an introduction to the JLPT N's liberal arts course. It emphasizes the importance of expressing gratitude in writing and provides examples, including the Tanabata festival, where people write their wishes on strips of paper. The video highlights the connection between writing and expressing emotions.

What does the author mean by 'writing with a feeling of gratitude'?

What is the relationship between mind power and words as described in the text?