Their minds are occupied with earthly things.
But our citizenship is in heaven,
and from it we also await a savior, the Lord Jesus Christ.
He will change our lowly body
to conform with his glorified Body
by the power that enables him also
to bring all things into subjection to himself.
Paul shed tears in telling the Philippians his old way was against God. In his sorrow for how he persecuted those who he, in his thoughts, he was righteous about. When Paul was converted, he suffered loss of self, but found a greater self in the life of Christ.
He went through a change like no other could ever experience. It enabled him to write about how Jesus will change our lowly body to conform with his glorified Body. Pauls conversion from one way of righteousness, in the light of Christ brought to him a new form of righteousness, one based on God's love.
There are people today who undergo conversions, not as Paul has, but in a unique way to themselves. It brought them to the Body of Christ, the church. They know how much Jesus has been glorified in themselves.
Some people will not understand the power that Paul speaks of, on how it enables Jesus also to bring all things into subjection to himself, unless the very conversion has happened to them. Our hearts cannot understand how this is possible until then.
When conversion happens, we give ourselves over to Jesus completely, this is how he brings all things into subjection to himself. We are whole, and united to the Body of Christ.