The human heart desperately cries out with the need for security. People attempt to build their futures around two gifts in life that tend to make them feel secure. First, they seek security in other people.
Sin causes the bottom to fall out of our security because sin brings death.
Therefore, one day we'll lose those who make us feel the most secure. Also, sin brings disappointment. Because of the fallen nature of humanity, our friends and family will eventually fail us. Absolute security can't be found in people. Second, people attempt to find security in material possessions.