However great a person may be, everyone has a great weakness: they all die. So we may honour the memory of dead prophets but we cannot have any relationship with them. Great people have another weakness; they cannot see the future; they may guess, but cannot see. David was both a king and a prophet (speaking to the people about what God had said to him) and dead, but in these verses Peter says that David also saw Jesus, His death and resurrection, in the future.