28 "I give them eternal life, and they will never die. No one can steal them out of my hand. 29 My Father, who has given them to me, is greater than anyone. No one can steal them out of my Father's hand."
Just as a shepherd protects his sheep, Jesus protects his people from eternal harm. While believers can expect to suffer on earth, Satan cannot harm their souls or take away their eternal life with God. There are many reasons to be afraid here on earth because this is the devil's domain. But if you choose to follow Jesus, he will give you everlasting safety.
(Tim's note: While I don't see it as a license to sin, isn't it wonderful to know that once you give your life to Christ you are protected for all eternity? I think so!)