Today is the feast of Saint Sergius.
Here is the story that goes with the above icon:
One night while St. Sergius was praying, he heard a voice calling his name. He was greatly surprised and, having read his prayer, he opened the window to see who had called him. A miraculous vision appeared before him. A great light coming from heaven made the night as bright as day. Once again a voice called him saying, “Sergius, you pray for your children and the Lord has heard your prayer. See how many monks have come together in honour of the Holy Trinity to be guided by you”. Then the saint saw a multitude of birds that were not only on the wall of the monastery, but also in the clearing surrounding it. The voice said: “The number of your monks will be as the number of the birds, and it will not decrease if they follow your path.”