In several of His sermons and public addresses, Jesus referred to Himself as the “good shepherd” and to his followers (the Church) as His flock. Back then, shepherding was a common activity, so people were able to fully understand the meaning behind His comparisons.
However, nowadays, specially if you’ve always lived in a big city like I have, you may not be able to grasp all the implications of this illustration.
First of all, nowadays we tend to think of shepherding as a job. The shepherd takes care of the sheep during the day, then late afternoon he puts them all inside a safe place and go home to watch TV, or something like that.
But Jesus wasn’t talking about someone’s job, but about someone’s reason to live. A relationship so strong that the shepherd would be willing to lay down his life for any of his sheep.