text: That's why, when one of the posters said, "Sure tastes like bread to me" --- this on a Sunday --- I responded, "I can see you had an accident today."  I'm sure you get it.  
  The philosophy comes directly and ultimately from Jesus. The first transubstantiation, as you know, took place at the Last Supper: "This is my body. . . . This is my blood. * * * Do this in remembrance of me." There is evidence that the Apostles themselves took Jesus to mean what Aquinas did, although they themselves did not know the Aristotelian and Thomistic "mechanics" of it.  Now, if you don't believe Jesus meant that the "this" really was his body, rather than a piece of bread, then you're right . . . transubstantiation does not make sense. Conversely, if you do believe, as Catholics do, that the first Eucharist involved Jesus' changing the substance of the bread and wine that he held in his hands, then it IS "ultimately from Jesus that we get the notion of transubstantiation."  It remains a mystery of faith.