It's with that idea that I think the first reading was chosen. The first reading lets Israel know that God was going to create a new covenant with His people. This is fulfilled through Jesus's death and resurrection. He could not "love" His life greater than us and accomplish what He did. There are some people and causes for which I would like to think that I would give up my life (if necessary) to protect. Jesus did so for all of us, no matter how valiant, no matter how depraved. He gave all of us the chance that we had denied ourselves. The death of a single grain of wheat bore great fruit.