Cyracuz, sorry, didn't mean to be so flippant. I've been studying up on this subject a bit and this is what I've come up with. We all talk about that word all the time without knowing the extent it is defined.
Of course it can be defined as the root of existence, yet as this root has been detached in innumerous human beings from the earth that fed it, symbolically speaking, it is left like the parasite plants feeding on the life of other species and other trees to them.
This explains why many people have lost the memory of their own days - memories of innumerable experiences of which valuale lessons could have been extracted and which could have served for future reference. But since they were lived with total absence of a consciousness state, they were lost and nothing was retained of them.
A totally different scenario occurs when the conscience, the root of existence, is nurtured by all the elements offered by Creation from which the conscience itself has emerged. Past events live in the present as if attracted by life in a way that not even the smallest detail, deemed useful to it in future performances, is forgotten.
As a tree that has lived for thousands of years cannot give testimony on everything that has occurred throughout these eras, in contrast, man, who is a witness to the facts that take place throughout his life, can retain a clear memory of everything surrounding his existence and also have the ability to describe these facts.
Animated by the cognitions registered in it, the conscience is proportionally generous to the calls of the intelligence helping it remember what it needs as man's achievements in cultivating knowledge become richer.
For example, if one man has spent his life doing nothing nor thinking about anything, and another who during the same number of years has cultivated his spirit by thinking and accmplishing many things, we could read into what both these lives tell us. We would find that in the first one nothing was registered as if it had not existed, while in the latter we would find printed in indelible characters his thoughts and achievements.
Is that better?