Sometimes, as writers, life gets in the way and doesn't let us achieve our daily, or even our weekly, writing goals and tasks. I'm here to proclaim a 'no guilt' zone! If you don't finish all your tasks--like your blog post, as a totally random example--let it go. (Unless you have a working time machine, in which case, go ahead and fix it.) :)
As a writer, I do struggle a bit with guilt, but I'm trying not to. It's better for me to move on, go on, write the next thing.
Which I should really go do now.
How about you? Do you every not achieve your writing goals? How do you handle it?