Maybe you have offered a hand to steady someone -- friend or stranger -- on an icy sidewalk.

Perhaps you've been the person who accepted that assistance.

There are surely times when you've confided in a friend, secure in the knowledge that what you talked of would be kept between the two of you. Could be you are the friend who has respected that confidence.

These and many other large and small acts are acts of trust. 

Community. The people who live on the same street, in the same neighborhood. People you see every week at the market. Those you know through your work. Your family. Friends of the heart. Passing acquaintances. The many communities of shared interests and shared histories to which each person belongs, in physical, geographical life and in the wide variety the internet offers help share and define identity. If things go well, community is a source of strength and support in hard times.