The perception we call time is, in fact, a method by which one moment
is compared to another. We can explain this with an example. For instance, when a person
taps an object, he hears a particular sound. When he taps the same object five minutes
later, he hears another sound. The person perceives that there is an interval between the
first sound and the second and he calls this interval "time". Yet at the time he
hears the second sound, the first sound he heard is no more than an imagination in his
mind. It is merely a bit of information in his memory. The person formulates the
perception of "time" by comparing the moment in which he lives with what he has
in his memory. If this comparison is not made, neither there can be perception of time.
Similarly, a person makes a comparison when he sees someone entering a
room through its door and sitting in an armchair in the middle of the room. By the time
this person sits in the armchair, the images related to the moments he opens the door,
walks into the room, and makes his way to the armchair are compiled as bits of information
in the brain. The perception of time occurs when one compares the man sitting on the
armchair with those bits of information he has.
In brief, time comes to exist as a result of the comparison made
between some illusions stored in the brain. If man did not have memory, then his brain
would not be making such interpretations and therefore the perception of time would never
have been formed. The reason why one determines himself to be thirty years old is only
because he has accumulated information pertaining to those thirty years in his mind. If
his memory did not exist, then he would not be thinking of the existence of such a
preceding period of time and he would only be experiencing the single "moment"
he was living in.