It is the receptivity of our heart and the passivity of our mind, it is the eagerness, the thirst and hunger after truth, it is the direction of our whole life to that Ideal from who all light and truth come, that alone can bring to us truth and the knowledge of God. All knowledge of the earth is as clouds covering the sun. It is the breaking of these clouds and the clearness of the sky, or in other words the purity of heart, which give the capacity for the knowledge of God.