We need to be determined to achieve positive change, and also be able to take a long view of what needs to be done. What is important is not to become demoralized. Optimism leads to success; pessimism leads to defeat. One person can be the source of inspiration for many others.
We can achieve peace of mind if we tackle our destructive emotions, so the goal of making the 21st century an era of peace and compassion is feasible. It will involve finding solutions to problems in dialogue, not the use of force.
Just read something about replacing "I'm sorry" with "thank you". So, instead of saying "sorry I was late", say "thank you for waiting for me". Replacing negativity with positivity and gratitude and breaks the "i'm sorry" cycle. Powerful.