Spoken from a Western viewpoint where icons mean nothing, gnosticism denies that each human is BOTH body and soul, and rationality reigns supreme.

The importance Christ lent to his Body is reflected in the words “This is my Body”, in the feast of the Incarnation, and in the definitions of the Council of Ephesus (431) and the Council of Chalcedon (451). 

In order to understand Inter Insigniores and Ordinatio Sacerdotalis you need to understand what a priest actually is, what function he performs, the meaning of “anamnesis”, and the Church’s theology of the Eucharist.

In particular you need to understand the theology of the letter to the Hebrews.