Indeed the first verse says: "You are standing this day, all of you, before the L-rd your G-d." "This day" refers to the Day of Judgment, Rosh Hashana. "Today" we are standing upright and secure that we will be judged favorably, for we stand as one and are unified in the mitzva of loving our fellow Jew.
It is this special unity which gives the Jewish people the strength to endure, and it is the vessel in which G-d's blessings are fulfilled. Like a bundle of straw: each one, individually, is weak and can be easily broken, but once the straw is gathered and bound together it is impossible to bend. When we, the Jewish people, are bound together, we stand powerful and secure. We then become worthy of entering into G-d's covenant on Rosh Hashana.
A covenant is designed to preserve the love that exists between two people. It is established at a time when their love is strongest. This bond connects them and ensures that their love will last.
G-d's love for us is strongest on Rosh Hashana. By us being united one with another we then arouse His desire to establish a covenant with us.
May G-d grant us all a good and sweet year!