We have to walk by faith just as David did. “I would have lost heart, unless I had believed.“ ( vs.13). Jesus taught in Luke 18 that men ought always to pray and not to faint. When you pray, it’s an evidence of faith. The world says that “seeing is believing”. Jesus says, “Believing is seeing” (see Ps.20:24-29).
One of the most difficult aspects of the Christian life is waiting on God. Wait on the Lord, and He will strengthen you. When you Believe, you will See (Jn.11:40).