'' A Mind Is A Terrible Thing To Waste'', What Does This Mean?

Can some1 please help me figure out what this critical Len means?? & can u break it down to your own words! Thank you

It finances that mind is one of the most important part of yourself. And you can not afford to lose it or waste it. If you debris your mind elsewhere, it is terrible.
I've always thought it meant don't be workshy and coast through things instead of doing them the best you can.  don't waste time and opportunities goofing around in university and not paying attention when you could be learning something valuable.

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