John 10:10

I know that I have been talking about John a lot and even John 10:10 specifically frequently. However, it seems like everywhere I look the message of John 10:10 is there: "The thief comes only to steal and kill and destroy. I came that they may have life and have it abundantly." In my devotion this morning it was there. I read a friend's blog and it was there. It is brought to the front of my mind during songs and conversations. What does it mean to have abundant life? Why is the thief so strong? Why does he want to steal, kill and destroy me? How do I attain abundant life?