All the periods of human life are recorded in the Preserved Script (Loh-e-Mehfooz). Every particle of the universe is the detailed picture of this record. If you go deep into the existence of a particle you will find a clue of this record. Similarly, stones contain a film about creation of stones. This film can be seen, only by delving into the stone itself. By going over this film a spiritual person comes to know all details about past or future events. The creative formulae in Adam have been working along the same pattern since the beginning of this universe. With the passage of time these formulae undergo apparent changes in vibration, but their base does not change at all. The human dispositions, for example, grief, violence, love, sex, etc. are the same but the appearance of these dispositions in different eras undergo change.