I think it's important for me to keep my childhood friends so that later on someone can appreciate how far I've come.
-- Greg (March: Tuesday, week 1 paragraph Page 19, Paragraph 2)

Importance: Greg says this toward the beginning of his diary when he's starting to work through the fact that Rowley has ditched him for a girl. This quote shows how important friendship is to Greg. It is a strong value for Greg, and it is shown throughout all of Hard Luck. If friendship wasn't important to Greg, he wouldn't care if he had the same friends from childhood all the way up to adulthood.

For boys, things are just a lot less complicated. For example, let's say one guy breaks something that belongs to another guy, but it's totally an accident. Well, five seconds later everybody's moved and things are pretty much back to normal.
-- Greg (March: Tuesday, week 1 paragraph Page 22, Paragraph 2)

Importance: Greg's short discussion of how much easier guy friendships are than girl friendships is...