Definitely this.
At the same time, I'd say to the OP: be aware that even the most enthusiastic blogger will go through different spaces; sometimes the words flow, sometimes you hit writers' block, sometimes you are on a high as your page views are jumping up, or people you value are praising...
Some excellent advice on this thread. Regarding the frequency of posting, I think it's best to choose a regularity that you think you could be maintaining in a year's time, and start with that.
Lots of blogs start posting five articles a day and then run out of steam shortly after. Or they post...