God told the Israelites that they would not drive out all their enemies the first year after they entered the land ( Exodus 23:29). They did not. However, Israel was less successful than she might have been due to incomplete obedience. [source][source][source]
""Little by little" does the work of God proceed through the individual soul. "Little by little" do the conquests of the Cross win over the world. "Little by little" is the unfolding purpose of Redemption made manifest to men and angels." [1][source]