with every fiber of one's being

Prepositional phrase

To the fullest extent possible.

Japanese Meaning

全身全霊で / ありったけの力を尽くして / 心の底から

One must protect the vulnerable with every fiber of one's being, even when doing so is difficult.

困難な時でも、弱い人々を守るために全身全霊を尽くさなければならない。

Sense（1）

To the fullest extent possible.