French poem about writing

Someone might know it please, this wonderful 30 secs soundtrack in a French movie: a young man on a train contemplating lost love, some voice-over goes:

To write, one must travel unknown worlds, meet unknown peoples
One must walk strange city streets
One must ...
One must ...
One must sit at the bedside of someone dying, the sounds of night outside the window
Then and only then does the very first syllable of a first word suggest itself.

Something like that.