How do Calvinists interpret 2 Peter 1:10?

> Therefore, brothers, be all the more diligent to confirm your calling and election, for if you practice these qualities you will never fall. - 2 Peter 1:10 (ESV) This seems to suggest that we have some level of influence over whether we finally end up among the elect, and that idea is contradictory to the Calvinist teaching of Unconditional Election. So how do Calvinists interpret 2 Peter 1:10?