Read the following passage carefully and then choose the right word to complete the sentence that follows. There was a king who lost his kingdom being defeated by his enemies. He wished to regain his kingdom at any cost. He collected troops and made six attempts one after another to drive away the enemies. But by irony of fate he was defeated each time. He then hid himself in a cave. One day when he was lying in a cave in a pensive mood, he saw a spider trying to climb up the roof of the cave. But it failed six times and succeeded by the seventh time. The king was inspired by this and he fought against the enemies for the seventh time. This time he became successful and regained his lost kingdom. ............... Is the mother of success?