In life, we each get a few shocking, external events that shake us. Life-quaking events that cause us to stop and question, that force us examine our lives from another perspective. It might be losing a job we've long held, the death of someone close, or dancing with death ourselves, but when tragedy strikes, awareness often results.
A good analogy might be swimming across a great body of water.
We put our heads down in the water to swim. Stroke by stoke, we move along. We focus on making progress in the direction we're heading. And maybe we are making great progress in that direction! The problem is, we can't see where we're going while swimming with our heads down.