The Bible says in Matthew 5:6, Blessed are those who hunger and thirst for righteousness, for they will be filled. The Jews were desperately looking for something. Unlike most of the Pharisees, they all knew that they didn't have righteousness and they wanted it so badly that they could taste it. That's why Jesus said in John 6:35, I am the bread of life. He who comes to me will never go hungry, and he who believes in me will never be thirsty. The righteousness that they wanted, and that Christ offered, could only come through Him.