A labour of love

[Tamara]

Hi

1.
his labour of love
(a/the) labour of his love

Which use is right?

2. Actually, I need to write something like ‘He entirely put (even, I'd say, 'insert' ) his soul in (into?) his job/work.’

This is the way how it would sound in my first language. The exact meaning of what I actually want to write.

My multi-dictionary system offers me several ways to express the idea in English. They are the following:

have heart in work
put back into work
put one's heart
put one's heart and soul into something
lend soul to a task

Hmm... heart… soul… back… heart and soul...
put... have... lend...
Do they all sound the same to you from the point of meaning? Emotionalilty?
_________________
It’s impossible to learn swimming without entering the water…

[Alan]

Hi Tamara,

You asked:

[Tamara]