Tesla's final years were marked by disappointment, yet he remained firm in his belief that while "the present is theirs; the future, for which I have really worked, is mine".
Tesla believed that the "secret of invention" was simple: . Nikola Tesla Secret
: A mechanical oscillator that Tesla claimed could locate mineral deposits or even cause earthquakes, alleging he once nearly brought down a building in Lower Manhattan with a small version of the device. Tesla's final years were marked by disappointment, yet
: He argued that "originality thrives in seclusion," away from the outside influences that "cripple the creative mind". : He argued that "originality thrives in seclusion,"
: Later in life, Tesla emphasized that intuition is "beyond knowledge" and that spirits can take us where senses cannot reach, claiming his greatest discoveries were works of pure intuition. 4. The "Lost" Inventions
: His attempt to create a system for the free, wireless transmission of energy through the Earth.