What separates animal mind from human mind is that humans are aware of time as a dimension. Humans not only remember the past, but also know that that there will be a tomorrow, a new season, a new year. This foreknowledge gives humans an incentive to make their tomorrow better than today or yesterday. In other words, the awareness of time as a dimension makes humans creative, while animals are content to live in an unchanging present.
The awareness of time as a dimension also is responsible for the development of human speech. Animal speech deals only with present information, so a few sounds and gestures suffice. Humans need to differentiate present information from that of the past and the future. If a human wants to enlist the help of his fellow humans in some future project, present information is not sufficient. He has to draw on past information to make his reasons clear for the need of future action, and for that simple sounds and gestures are insufficent. Hence the need for differentiation among present, past and future information, and, presto, human speech is born.
