Seth's Blog: Saying 'no'
http://sethgodin.typepad.com/seths_blog/2009/05/saying-no.html

Via @orian

I work with and associate with a lot of talented people in this space. On a rare occasion people mistake me for talented. This post is a great reminder that it’s okay to say no to some requests, in fact, sometime it’s a game changer.

Saying no to loud people gives you the resources to say yes to important opportunities.