culling

Everyone looks at their work and thinks about what they like and don’t like. But until you make an actual decision about each image-is it the very best image, is it good (but not great) or was it just practice-you won’t open yourself up to the learning that comes when you actively force yourself to separate the best from the throwaways. -Lara White

Culling is a word used by photographers for something I don't do too often.  It dates back to the 1200's where it meant "to put through a strainer" (see etymonline's second entry for cull... unless you want to read about testicles, in which case read the first).
I need to do this with my photography-- I have literally thousands of pictures that are simply mediocre that I have yet to bring myself to throw away.  Why shouldn't I?  Will I ever use them if they're mediocre and I have better ones?  Probably not.  Will the clients ever want them if I already provided them with the best photos I could produce?  Doubtful.
Ms. White concludes,

As photographers, I believe it’s our job to say something with the images, to add something more than just what meets the eye. I learned this more in the editing room than on any shoot. The editing or culling process allows me to see what works and why. And even more important, I learn what doesn’t work.

 And isn't this what we should be doing with life anyways?  Give it a try.  If it doesn't work, don't keep it.