How do we face obstacles “prayer?”

King David’s prayer “you come to me with a sword, shield, and a spear but I come to you in the name of the Lord!”

1 Samuel 17:45 KJV

[45] Then said David to the Philistine, Thou comest to me with a sword, and with a spear, and with a shield: but I come to thee in the name of the Lord of hosts, the God of the armies of Israel, whom thou hast defied.