Do we own things or are we a steward over them? As Christians, we give ourselves to Jesus. Jesus gave Himself completely to us, so as Christians we are to imitate Christ and give ourselves completely. Christians are to be Christ-like.
Now, that does not necessarily mean that we need to sell everything and give the money to the poor. But we need to give everything to Jesus. However, He may or may not give it back to us. It is still His, but if He gives it back, we are now the stewards of what Jesus gave us.
It is very freeing to have no possessions. After all, if we attach ourselves to possessions, our possessions end up owning us. Money and things are not intrinsically evil. They are needed in many of our vocations, but we need to be detached from them.
Jesus told us, “Much will be required of the person entrusted with much, and still more will be demanded of the person entrusted with more.” – [Luke 2:48]