It's all too easy to pat ourselves on the back and congratulate ourselves on how clever we were. In order to keep a true perspective as to where our success really comes from we need constant reminders. In this week's Parsha, the Torah tells us that for every thousand soldiers that went out to fight for the Jewish People, another thousand stayed in Ere Yisrael and prayed for them. You might that think that this was to give those at the front added protection. The real reason, however, was that those who were fighting shouldn't be under any illusion as to where their success was coming from.
Nothing lasts forever.
However when Hashem redeems His people Himself, in His Glory an His Majesty, there will be no human imperfection in the redemption, and thus it will be complete and eternal. It has cease to have the power of furthering itself, of bringing forth new life. It wil always remain what it is now. Static and unchanging. It is the essence of dynamism, of development and growth.