Ideas are like corks bobbing around in the sea of mind.
Some should be allowed to just float on by.
Some should be looked at more closely.
Some should be pulled from the waters and pursued with passion.

Knowing which ideas fall into which group is not easy.
Some of it comes from experience.  Mistakes of the past can be steps to future success if you have the right attitude about it.
Other times you can rely on your own intuition to tell you.
And sometimes, you just have to let go and let God.  He can guide you if you let him and your goal is a worthy one.