I am thinking about the resurrection of Lazarus in the Bible.
If Jesus was there when he was sick, he could have healed him but then it is just one healing among so many.
If Jesus came right after he died, then he could have raised him from the dead but again it is one resurrection among many that Jesus performed.
Jesus only came after he was buried for four days. Jesus’ arrival was delayed. He only came when all hope was gone. Then the big miracle happened: the resurrection of someone who is already dead for four days.
Other than the joy of having their brother back, Mary and Martha experienced that with God nothing is impossible. Their story also teach us that the more we have to wait the bigger the miracles and the blessings.
With this understanding, one can truly say that he who wait on the Lord will renew his strength.