heart and soul

Noun

uncountable

the core of a thing; the most essential or important part / passion; true commitment

Japanese Meaning

ものごとの核心、本質、最も重要な部分 / 情熱、真の献身

Her dedication is the heart and soul of the organization.

彼女の献身は組織の中核です。

Sense（1）

the core of a thing; the most essential or important part

The heart and soul of any democracy is its electorate.

Sense（2）

passion; true commitment

She put her heart and soul into the project.