The thief comes only in order to steal and kill and destroy. I came that they may have and enjoy life, and have it in abundance (to the full, till it overflows).
We know God is not a thief, so anything that involves stealing, killing, or destroying is not from God but from the thief himself, satan. It is interesting to note that in it’s context if you read the previous nine verses here you find out Jesus begins by teaching us that any shepherd who did not come through the gate, which He tells us He is that gate, is a thief. Jesus according to Ephesians 4 is the One who gives us the five fold ministries gifts, which includes the pastor, which is the word for shepherd. What Jesus is teaching us is that any pastor not gifted (ordained) by Him is a thief.
In 2 Corinthians 11:15 we find out that satan has his own ministers who appear as ministers of righteousness, but they are under his control. This is the primary way satan steals, kills, and destroys through false and deceptive teaching mixed with some truth. Paul called them teachers who would tickle one’s itching ears. So if we don’t want to be taken advantage of and we want to experience the life God has for us, we need a shepherd who will teach us as Paul also said the whole counsel of God. Beware of having your ears tickled and only hearing what you want to hear but not receiving all of what scripture teaches. It is in knowing the truth that you will be set free from the destructive works of the thief and experience abundant life.