Paul first experienced the "God of the Impossible" on the road to Damascus. However, it was in the months and years after that he grew to love and develop an intimate relationship with his God. It was also in this time that he began to fully understand that God could "do immeasurably more than all we (he could) ask or imagine, according to his power that is at work within us (him)....". (Eph. 3: 20-21) The disciples also experienced the "impossible" as they watched and walked with Jesus during their three years together.
What need, issue, situation is it that you face that from all human perspective is impossible? However, Paul would say to you and me that through God's power in us, He can do impossible things. Are you ready to trust? Am I ready to be obedient?