There are many ways in which people try to know about past, present, and future: by astrology, by palmistry, by physiognomy, by reading the features, and in many other ways. Although all such methods can often be helpful and give us some knowledge -- for knowledge is within our reach and we only have to ask for it and it is given -- yet by self-realization we can understand this knowledge so clearly at a certain stage, that no other method is necessary. It becomes natural; as it is natural for the eyes to see, so it becomes natural for the heart to see into the past, present, and future.