I am the good shepherd; the good shepherd lays down His life for the sheep--John 10:11
Jesus Christ tells us that He is the good shepherd.  He is willing and He has laid down His life for us.  Are you willing to be His sheep?
People are referred to as sheep in the Bible.  Sheep are one of the very few animals that lack a good sense of direction and can easily walk astray.  Even ants and bees have sense of direction, yet it is difficult for sheep to find their way back once they get lost.  AS sinners, we all lost and walk astray from God. 
It is indeed difficult for the lost to find their way back unless clear instruction is given.  God has sent his beloved Son to look for, find, and bring home His lost sheep.  God wants His disciples, who were lost but now found, to introduce other lost sheep to the good Great Shepherd.