Amos is talking about the un-readiness of the believers. He said they got away from the lion and the bear and ran into their house leaned upon the way and was bit by a snake. Many are worried so much about what's going on on the outside of our bodies and is failing to pay attention to what's going on on the inside of our heart. God delivers us from the lions or problems in our life. He even delivers us bear which could be sickness and disease and instead of us continuing to fight the good fight of faith, we get comfortable and relax and get bit by the snake. We must understand that it's not what's going on on the outside but rather what's going on on the inside of the house (our heart) that keeps us from obeying God and pleasing God