Scratching an itch

It is a wise phrase that is attributed to the origin of great startups.

Project::raise is about scratching our own itch. My colleagues have been asking this and that, wishing this and that for a long time; the itch has become so intense to deserve a soothing scratch. The itch that has been waiting for 4 years to get the scratch. The itch that would make important part of development ecosystem better when scratched. The itch that I feel itchy about.

I couldn't find who has come up with the phrase. However, if you need further reading on correlation between scratching an itch and doing startup, read David Cohen's post.