Poem/Quote original text

Hi everyone,

I am searching for the original text of a quote or poem (I don't know to categorize) he wrote.

It's this one:

To love very much is to love inadequately; we love-that is all. Love cannot be modified without being nullified. Love is a short word but it contains everything. Love means the body, the soul, the life, the entire being. We feel love as we feel the warmth of our blood, we breathe love as we breathe the air, we hold it in ourselves as we hold our thoughts. Nothing more exists for us. Love is not a word; it is a wordless state indicated by four letters.

Can anyone provide me the original French text?

Kind regards,
Judith