First, let's deal with a macro example. We just commemorated the ninth anniversary of the 9/11 terrorist attacks. While 9/11 served as a tragic wake up call for the United States to be more proactive when it comes to radical Islamic terrorism, Osama bin Laden has yet to be killed or captured. This might lead one to believe that there may never be justice served for the thousands of innocent people whose blood he has on his hands. But this will not be so. There was a Torah Code found about 9/11 that might be letting us know that there is indeed hope for the future. In it, bin Laden is named as the agent of destruction and Mashiach (Messiah) as the one who will take revenge. Exactly what this revenge entails, who Mashiach is, and when this will take place is not yet known. However, these two men are more than just individuals - they represent life vs. death and good vs. evil. Perhaps God is providing us with a preview of coming attractions, hinting that evil will have its comeuppance and goodness will reign on earth.
Now, let's consider a micro example. All of us have to deal with people in our day to day lives. Some of these individuals are friendly, while others drive us nuts. Yet, even if you get along with someone, you will eventually be disappointed if you overly trust in them. Unfortunately, human nature is fickle and unreliable. However, you will always have peace-of-mind if you trust in God. As two very instructive verses state: "Cursed is the man that trusts in man" (Jeremiah 17:5); "Blessed is the man that trusts in God" (Jeremiah 17:7). Especially during the High Holidays, it's important to remember that God is the ultimate just and merciful being, and He judges us the way we judge other people. If we generally give others the benefit of the doubt, God will do the same for us. Thus, while it's extremely important to be kind toward other people, our hope and trust should only be in God.
Properly-placed hope is a key element in becoming a good person, as well as a way of producing more optimism in a world that easily creates pessimism:
Being more optimistic will also help in the goal of Jewish unity. If we simply write this off as a dream that can't be realized, it will become a self-fulfilling prophecy. However, if we each focus on improving our own interpersonal conduct, it might just happen after all.
And with regard to combating hopelessness due to all of today's problems, take solace from four of the greatest words in the English language:
This too shall pass.