O eternal Trinity! O Godhead!

O eternal Trinity! O Godhead! That Godhead, your divine nature, gave the price of your Son’s
blood its value. You, eternal Trinity, are a deep sea. The more I enter you, the more I
discover, and the more I discover, the more I seek you. You are insatiable, you in whose depth
the soul is sated yet remains always hungry for you, thirsty for you, eternal Trinity, longing to
see you with the light in your light. Just as the deer longs for the fountain of living water, so
does my soul long to escape from the prison of my darksome body and see you in truth. O
how long will you hide your face from my eyes?...

You, eternal Trinity, are the craftsman; and I your handiwork have come to know that you are
in love with the beauty of what you have made, since you made me a new creation in the blood
of your Son. O abyss! O eternal Godhead! O deep sea! What more could you have given me
than the gift of your very self?

– from The Dialogue by Catherine of Sienna (1347–1380)