Background to 1 Peter 5:8-9
The devil is seeking to devour believers which is why we are told to be “sober and vigilant.”  This means we should be alert and aware of the things going on around us.  Satan wants to wreak havoc among the people of God that is why we must always be alert and aware of his schemes that can cause division.  His ultimate objective is to devour his prey and in the church it is to destroy relationships.