In the 70's there was a saying "a mind is a terrible thing to waste" that was quite popular at the time as a way of promoting education and access to college education.  It worked and was quite successful.  The mind is a spiritual component of the human body which allows our soul to engage with the world.  Our mind performs many tasks each day so in essence it is not what is wasted.  Rather is the improper use of the mind that causes waste.  I relate this waste to the manufacturing process, providing examples of what waste possibly looks like in our lives.  I also talk briefly about the process of hitbodedut - read more about it here  https://breslov.org/hitbodedut-jewish-meditation-how-to/.