Fr Antony Jukes says that St. Athanasius used the analogy of the sun, its light, and its warmth to explain the mystery of the Holy Trinity: just as the sun, light, and warmth are distinct yet inseparable and eternal, so too are the Father, Son, and Holy Spirit. The sun represents the Father, the light symbolizes the Son, and the warmth reflects the Holy Spirit, illustrating their unity and co-eternity in the divine essence.