"Portrait of Saint Augustine, aged and with facial features marked by time

"Portrait of Saint Augustine, aged and with facial features marked by time, In an austere study setting. He is wearing traditional priestly garments and holding a burning heart in his hand, symbolizing a deep spiritual fervor and introspection. He's sitting at the table, Surrounded by books and scrolls, with an expression of wisdom and contemplation. The soft illumination should highlight the burning heart and the face of Saint Augustine, reflecting the intensity and depth of his spiritual quest