"The organization of supplies, the command of men, anything in any way constructive requires more than intellect; it requires energy and drive and an unrelenting will to serve the cause, regardless of one's personal interests."

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I do not rush into constructive work. When I get an idea, I start right away to build it up in my mind. I change the structure, I make improvements, I experiment, I run the device in my mind. It is absolutely the same to me whether I operate my turbine in thought or test it actually in my shop. It makes no difference, the results are the same. In this way, you see, I can rapidly develop and perfect an invention, without touching anything.

— Nikola Tesla