Biting Off More Than You Can Chew

The flame of G-d burned within me when I was young: I believed that I would return the whole world to good. As I grew older, my enthusiasm waned, and I said: "I see that I will not be able to fix the entire world, so I will try to improve the people of my own city." Years passed, and I realized that I had bitten off more than I could chew. I then decided that it would be enough to better my own family. Now that I am old, I no longer dream. My only prayer is that I should improve myself.

(Rabbi Chaim of Sanz)