You say that you do not understand how the saints in Heaven can hear us when we pray to them. Think, then, of the rays of the sun – how they come down from heaven to us, shedding light upon everything throughout the earth. The saints in the spiritual world are like the rays of the sun in the material world. God is the eternal life-giving Sun, and the saints are the rays of this all-knowing Sun. Just as the eyes of the Lord look constantly upon the earth and its inhabitants, so also the eyes of the saints cannot but turn in the same direction...
The heart is the eye of the human being. The purer the heart is, the quicker, further, and clearer it can see. But with the saints of God this spiritual eye is refined, even during their lifetime, to the highest degree of purity possible for man, and after their death, when they have become united with God, through God's grace it becomes still clearer and wider in the limits of its vision. Therefore, the saints can see very clearly, widely, and far: they see our spiritual wants; they see and hear all those who call upon them with their whole heart... How easy it is to communicate with the saints!