• Of all the frictional resistances, the one that most retards human movement is ignorance, what Buddha called 'the greatest evil in the world.' The friction which results from ignorance ... can be reduced only by the spread of knowledge and the unification of the heterogeneous elements of humanity. No effort could be better spent.

    Nikola Tesla (2013). “The Problem of Increasing Human Energy, With Special References to the Harnessing of”, p.15, Simon and Schuster