Here Jesus is mildly rebuking his disciples because they should have understood what he had been talking about. This can be written as a statement. Alternate translation: "You should not be thinking that I am talking about actual bread." (See: [[rc://en/ta/man/jit/figs-rquestion]])
These questions have the same meaning and are used together to emphasize that they do not understand. This can be written as one question or as a statement. Alternate translation: "Do you not yet understand?" or "You should perceive and understand by now the things I say and do." (See: [[rc://en/ta/man/jit/figs-parallelism]] and [[rc://en/ta/man/jit/figs-rquestion]])
Here "hearts" is a metonym for a person's mind and "hardened" is a metaphor for not being able or willing to understand something. Jesus uses a question to scold the disciples. This can be written as a statement. Alternate translation: "You are so slow to understand what I mean!" or "You are unwilling to understand what I mean!" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-metaphor]] and [[rc://en/ta/man/jit/figs-rquestion]])