Jesus told us something very interesting when he said “If you had faith the size of a mustard seed, you could say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it would obey you. (Matthew 17:20) Most bible scholars tell us that because Jesus is using the reference of a mustard seed, which is one of the smallest seeds, He is showing us it's not the "size" of your faith that matters.
While size may not matter, quality certainly does matter. If you recall other examples in the New Testament, Jesus was rejected at Nazareth and because of the people's unbelief, Jesus didn't do any miracles among them except to place his hands on a few sick people and heal them. The Bible says that Jesus, "was amazed at their unbelief" (Mark 6:6) Also, the time that Peter had enough faith to get out of the boat, he soon started sinking and Jesus replied, "You have so little faith," Jesus said. "Why did you doubt me?" (Matt 14:31)
Quality faith that is needed is faith that doesn't waiver. If we have faith in the government, we will likely be disappointed. If we have faith in our own ability, we also will likely be disappointed. If we however, place our faith in God of the Bible, we will certainly have the quality faith needed for the journey.