The Pharisees came up and started a discussion with Jesus; they demanded of him a sign from heaven, to put him to the test. And with a profound sigh he said, ‘Why does this generation demand a sign? In truth I tell you, no sign shall be given to this generation.’ And, leaving them again, he re-embarked and went away to the other side. The disciples had forgotten to take any bread and they had only one loaf with them in the boat. Then he gave them this warning, ‘Keep your eyes open; look out for the yeast of the Pharisees and the yeast of Herod.’ And they said to one another, ‘It is because we have no bread.’ And Jesus knew it, and he said to them, ‘Why are you talking about having no bread? Do you still not understand, still not realise? Are your minds closed? Have you eyes and do not see, ears and do not hear? Or do you not remember? When I broke the five loaves for the five thousand, how many baskets full of scraps did you collect?’ They answered, ‘Twelve.’ ‘And when I broke the seven loaves for the four thousand, how many baskets full of scraps did you collect?’ And they answered, ‘Seven.’ Then he said to them, ‘Do you still not realise?’