"By faith Abraham obeyed when he was called to go out to the place which he would receive as an inheritance. And he went out, not knowing where he was going. By faith he dwelt in the land of promise as in a foreign country, dwelling in tents with Isaac and Jacob, the heirs with him of the same promise; for he waited for the city which has foundations, whose builder and maker is God." Heb 11:8-10
Let us reflect for a bit on the faith of Abraham. He did as the Lord said - period. He picked up and left his homeland, everything he knew. Scripture does not record that he complained, resisted or suffered from an over attachment to worldly things. God spoke to him and he did as he was told. He was even willing to sacrifice his much loved and long awaited son as depicted above.
How does one dwell on earth and be so unattached to the world? I am no theologian, but I think one way is to keep the eyes of your soul continually upon Heaven. Do not think your reward shall be here on earth, but rather in Heaven. Let us walk humbly with our God, strive to accept everything that comes to us as a gift - every suffering, every loss, every anguish as if it is the greatest treasure and thank Him for it. He orders all things to our good. If we ask for our purification here on earth, we will need less in purgatory. Amen+