Do you still not perceive? Matthew 16:9 Comprehension is very important, especially in matters dealing with faith. Jesus warned of the "leaven of the Pharisees and Sadducees," meaning for them to beware their influence. Theirs was a negative influence on the things of God, and not necessary, in fact, evil. The disciples did not understand and wondered why Jesus was talking about bread; thus the question for today. Jesus explained it, and they understood. If you don't understand something, ask in prayer, or ask someone who might know.