<human>: Can you give me the gist of the text in a nutshell?

I'm currently training for my first full marathon (Seattle Rock n' Roll, June 22). I've run a couple of half marathons over the past year, and I am following [Hal Higdon's Novice 2 program] in order to prepare for my first marathon. My goal, like many runners, is to run the marathon in less than 4 hours.

It seems like everyone is telling me to not worry about pace, and that running slower is fine. Higdon says that in training runners should "do their long runs anywhere from 30 to 90 seconds or more per mile slower than their marathon pace." Every other week in the Novice 2 plan has a medium-length run at pace (for me, 9:09), but that's it. And after reading the post on [easy runs] it seems like I'm supposed to run those at the same pace as my long runs. This worries me, because I don't see how training at 30-90 seconds per mile slower for almost all of my runs is going to prepare me to run a full marathon (6.2 miles than I will have ever run before) at my goal pace.
<bot>: Does running almost all of my runs at 30-90s/mile slower really prepare me well enough to run at my goal pace for an entire marathon?