Indeed... If we hadnt memory or imagination, time would be a meaningless concept, and we only would be aware of the present... cause without memory we wouldnt remember the past, and without imagination we wouldnt imagine the future.

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"Everything we do, everything we are, rests on our personal power. If we have enough of it, one word uttered to us might be sufficient to change the course of our lives. But if we don't have enough personal power, the most magnificent piece of wisdom can be revealed to us and that revelation won't make a damn bit of difference." Don Juan Matus - Tales of Power