When Google shows multiple pages from your site, it is a sign that Google is confident that when people are searching for you, your site is what they are looking for. Google has determined that deep links into your site (such as your contact page, or your top articles) are likely to be more useful to searchers than links to other sites.
This means that your personal brand is growing and Google is recognizing it. Google has given your site more real estate in the SERPs which is something that most webmasters strive for. At some point Google may even use "site links" when somebody searches for you. Site links shows your main URL, and then many sub-pages indented under it like this for a search for me:
We have a very popular question here about how to encourage Google to show site links for your website