The tragedy at Monday's Boston Marathon has saddened the nation. Individuals and families affected by the trauma of inexplicable physical, mental and spiritual harm are in our thoughts and prayers. Unfortunately, through disturbing events like this, we are reminded of our vulnerabilities. But as a result of crisis and fear, we find that human potential is unlocked when we work together to aid and console each other. In times of despair, caring communities of people carry all of us through.