That Fadres Sone hath alle thyng ywroght,
And al that wroght is with a skilful thoght;
The Goost, that fro the Fader gan procede,
Hath sowled hem, withouten any drede.

– Geoffrey Chaucer

The Canterbury Tales, The Second Nun’s Tale. Cecilia explains one of the key tenets of Christianity to Tiburtius, the Holy Trinity. This is the belief that God exists three persons, the Father, Son Jesus Christ and Holy Spirit, and they are one God. Through the Holy Spirit mankind was given souls, so that they might have eternal life beyond the body.