In Luke 17:5-10 the apostles recognized two things about faith: 1) that faith can grow and 2) that we depend on God for faith. Their request suggested that they did not believe that they had enough faith for the job at hand. However, when Jesus replied to their request the Greek grammar implied they already had the necessary faith, they just needed to use it. As the mulberry or sycamore tree obeys our order to be uprooted and planted in the sea by our faith, so too does a slave obey his master. We cannot earn God’s favor by merely doing what he expects. We must have faith, but asking God for more faith could be dangerous. We might become so Christ-like that we begin to do really big things and even live lives of radical self-sacrifice for others.