Jesus rebuked the religious leaders of His day of being clean on the outside but inwardly being filled with all corruption. Jesus’s disciples have an undivided heart, a purity or singleness of devotion to God. Jesus is first in their lives. They are devoted to pleasing Him. There is a sincere focus on fulfilling the mission Jesus has given them. However, none of us perfectly thirst or are perfectly pure in our devotion to Jesus Christ. We need the grace of God everyday for everyday we fall short of a pure heart.