Re = again
Vise = see or look, as in vision
-ion = a suffix that alters the form of the word to become a noun
re + vis + ion = the process of seeing again
Of course, this is simply not that easy.
When I have been writing--whatever, a story, a novel, a blog--for a long time, I cannot see it from any other perspective but my own. Revision often requires a separation of time or others' opinions.
Time and others are perhaps the two biggest keys to revision.
2. Others. Sometimes I write and think I am being clever. This is rarely the case. When other people (my awesome blog group, the Indiana Writer's Center Members, to drop a few names) tell me that I'm missing the mark, I take a deep breath and ask me how to fix it. I'm stunned at how smart these people are.
Revision takes a certain amount of humility. Very, very few people write brilliantly on their first try, and the rest of us need to try again and struggle to make our ideas more cohesive and interesting.
And this, of course, takes revision.