I simply observe that the sentence “When we eat this Bread”, and others similar (Holy Bread or Bread of Life) , at face value refer to bread in a substantial manner.
Bread in these phrases is not to be understood in a univocal or substantial manner. The word ‘bread’ here is being used in an analogical or equivocal meaning (without thinking about it further presently, I think the meaning would be called analogical and not equivocal. It definitely is not univocal). Similarly, in John 10:9, Jesus says ‘I am the door’. The word ‘door’ here does not carry a univocal meaning in that Jesus is literally a door or that Jesus’ phrase ‘I am the door’ carries the same meaning as ‘the door of my house’. Jesus is using the word ‘door’ here in an analogical or equivocal sense. Again, in John 6:35, Jesus says ‘I am the bread of life.’ Jesus is not literally a piece of bread so he is using the word ‘bread’ here in an analogical or equivocal sense but if we were to choose between analogical or equivocal, I think it would be analogical. An analogical application of some word is when the word is applied partly in the same sense and partly in a different sense. We do it all the time in everyday life. For example, the term ‘cheerful’ can apply to a smile, to a thought, to a landscape, to a color, but partly in the same sense and partly in different senses. We also use words in an equivocal sense regularly. For example, a ‘table’ may mean a piece of furniture or the table of contents of a book.
As the saying goes, “If it looks like a rose and smells like a rose…”
Therefore those who do think in this way would find the assertion that the consecrated species is no longer bread to be a logical contradiction.
This is the mystery of the eucharist. What looks like bread, tastes like bread, feels like bread, smells like bread, is not bread. The laws of nature in the eucharist have been suspended by God’s almighty power. The eucharist is a supernatural miracle. It is a one of a kind substantial change not observed anywhere else in the universe which is why the substantial change that occurs to the bread and wine at Mass has a name all its own, namely, transubstantiation. Secondly, you simply do not have bread and wine without the substances of bread and wine being present and the substances of bread and wine are not present after the consecration. What remains of the bread and wine after the consecration at Mass are the accidents or species (appearances) of the bread and wine. You seem to be confusing accidents with substance or identifying accidents with substance. The substance ‘stands under’ and gives being to the accidents. The accidents are what is apparent to the senses and sense observation. Sense observation does not penetrate to the substance. The substance is only known by the intellect. Bread and wine like all created things have a composition of substance and accidents. In the miracle of the eucharist, the substances of the bread and wine change into the substances of the body and blood of Christ while the accidents or appearances of the bread and wine remain by divine power.