vital spark

vital force (or the application of such a force)

Japanese Meaning

生命力 / 活力、原動力

After weeks of treatment, the physician was relieved to see the vital spark return to his patient's eyes.

数週間の治療の後、医師は患者の目に生命力が戻ってきたのを見て安堵した。

Sense（1）

vital force (or the application of such a force)

vital sparks

（ plural ）