"O LORD, please open his eyes that he may see" (6:17). Elisha the prophet prayed that the young man could see the truth: that God’s armies were surrounding them and protecting them. This kind of “seeing” was an opening of the heart as well as the eyes, involving faith and trust. When Elisha prophesied that the famine in Samaria was about to end, the king’s captain chose not to believe (ch 7). Therefore, though he saw God’s deliverance, he did not share in the blessing.
Hebrews 11 teaches us that faith does not mean being optimistic. It is acting on what we know is true, whether seen or unseen, because we believe that He who promised is faithful.