Cassian and Germanus seek out the guidance of the elder Serenus, whose name captures his character.  Serenus had attained great purity of heart, peace, and freedom from the carnal desires of the flesh.  Cassian and Germanus come to him in a state of despair; for although having labored for years they found their thoughts wandering and pulling them back to the things of the world and the passions.  In their desolation they had begun to give up any hope of attaining such virtue and complain to Serenus that it is their nature that has prevented stability of mind and heart.  Serenus in both his teaching and example is becomes the cypher though which we are meant to come to understand both the path to and nature of purity of heart.  It is desire and thirst for God alone that can bring us to this freedom.  Faith, Hope and Love are the weapons we use to engage in the battle (the theological virtues that have God as their end) and the depths of the heart is purified by the sharp sword of the Spirit.  Once again the discussion was thoughtful and enriching and Cassian’s insights immeasurably valuable.