How Screwing on a Light Bulb is like Filmmaking

I met up with another filmmaker who was a former attorney many years ago. We were talking about leaving the security of a corporate job to pursue a career as a filmmaker (writer, actor, artist, etc). She said something that I found quite interesting. She said, pursuing your passion is like screwing on a light bulb. That is, if you're going to screw on a light bulb, screw it on all the way. If you do it half-assed, the light won't turn on. She left her cushy corporate job years ago and never looked back. Anyway, this isn't technical advice about how to make an indie film, but I think it's important for a filmmaker to keep their passion alive for the project even when they don't know where next month's rent will come from. Heck, JK Rowling had to sleep in her car before she became a gazillionaire, didn't she? Or was that Jewel?