In the World But Not of It

How are we dual citizens? Why are we warned not to set our heart on anything in this flesh, in this world because it is all passing away? How are we told to live as sojourners in this world? What is the snare that we are warned about? Is this a list of dos and don’ts? Why are we warned to be aware of what we are in the flesh, how should we take heed and not let down our guard? Where is the greatest evil? What did Christ mean by ‘world without end’? How are we to take heed that no man deceive us?