One must be sane to think clearly

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One must be sane to think clearly, but one can think deeply and be quite insane.

Nikola Tesla

July 10, 1856 – January 7, 1943
Nikola Tesla (10 July 1856 – 7 January 1943) was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.