Can I say "I have been nourishing my passions"?
Or something similar to express the figurative fact that "I have been developing and nourishing them"?
Yes, I believe you can. The phrase makes semantic sense, in that
So in the second sense, you can "promote the growth of" your passions.
The phrase has been used this way, mostly in informal biographical or autobiographical writing. Note that almost all of the examples I could find were blogs, which does raise the question of whether this is a new turn of phrase, and how "accepted" it is elsewhere (e.g. journalism, books, etc.). EDIT: I did find some old references to the phrase, although in one case using the word
The Atypical Scandinavian, in the third person:
and several places in the first person:
I'd say feeding and cultivating one's passion are much more common collocations. Nurturing one's passion is also possible.
However, there's an article from the Irish times with this title:
Eat, play, love: nourishing a passion for healthy eating (http://www.irishtimes.com/life-and-style/health-family/parenting/eat-play-love-nourishing-a-passion-for-healthy-eating-1.1598909)
So it's up to you. I wouldn't have a problem with any of these verbs. :-)
I think nourishing your passion is more in tune with maintaining an existing passion. Same for feed ones passion. Developing doesn't seem to fit well in my opinion b/c I'm thinking of a sports fan or a gambler.
To me nourish or feed is more like sustain or maintain ones passion.
Develop ones passion I would think something like reinvigorate or expound upon ones passion. Maybe say something like, "John Doe proved his [blank] passion that he really wanted to learn skateboarding beyond his current skills that he was willing to do [this]."
I'm thinking a word [blank] is something like, "yearning", "undying", "driven", and [this] is something "like break a leg", "earn a medal", "perform a double clutch something move".