As mind is etymologically associated with memory, we can primarily consider it to be a store of concepts, as mental images resident in individual psyches, as abstractions from the Cosmic Psyche.
As such, the mind is highly energetic, a quite different conception of energy from that associated with Einstein’s famous equation E = mc2.
The invention of the stored-program computer in the middle of the twentieth century enables us to develop a much deeper understanding of what causes us to behave as we do than was possible for our forebears. For this event marked the greatest revolution in human learning since our forebears began to pick up stones to make cutting tools with pieces of flint.
The computer is a machine quite unlike any other that the Homo genus has invented during the past two thousand millennia. Unlike the flint axe, wheel, printing press, telescope, steam engine, and telephone, for instance, which extend our rather limited physical abilities, the computer is a tool of thought, able to extend the human mind, even in some cases replacing it.
Middle English minde, from Old English gemynd ‘memory, thought’, from Proto-Germanic *ga-mundiz, from PIE base men-¹ ‘to think’.
Despite this Germanic inheritance, there is no corresponding word in German and Swedish, for instance, for mind.