As a devotional part of the eucharistic liturgy, the Agnus Dei also carries a missional aspect. Exegeting the verse Jn 1.29 (‘Behold the Lamb of God…’) two major theories of the atonement are seen to be involved and are applicable to the meaning of the Agnus Dei. These two theories of the atonement (ransom and substitutionary) in their relationship to each other are noted, and a primary emphasis on the ransom theory and its background of the Passover is argued for. The Passover Lamb focus is seen as liberative and missional. This leads to seeing the Agnus Dei in its referring to the redeeming death of Christ (‘Lamb of God’) as appropriately accompanied by the fraction of the bread. The history of the Agnus Dei and its Eastern Orthodox roots are brought to bear, as are our modern Anglican liturgical forms.

作为圣体礼仪的灵修部分，主祷文也具有传教的一面。解释约翰福音 1.29 节（“看哪，神的羔羊……”）两个主要的赎罪理论被认为涉及并适用于《Agnus Dei》的含义。指出了这两种赎罪理论（赎金和替代）之间的相互关系，并主张主要强调赎金理论及其逾越节的背景。逾越节羔羊的焦点被视为自由和使命。这导致我们看到《Agnus Dei》在提到基督（“上帝的羔羊”）的救赎之死时，恰如其分地伴随着面包的一小部分。圣母经的历史及其东正教根源以及我们现代英国圣公会的礼拜形式都得到了体现。