“Both in fighting and in everyday life you should be determined though calm. Meet the situation without tenseness yet not recklessly, your spirit settled yet unbiased. Even when your spirit is calm do not let your body relax, and when your body is relaxed do not let your spirit slacken. Do not let your spirit be influenced by your body, or your body be influenced by your spirit.”
– Miyamoto Musashi, ISTP

ISTPs are known for their quiet intensity, their fearlessness, and their ability to think quickly in a crisis. They combine a masterful use of Introverted Thinking (Ti) to form deep, logical conclusions and to stay objective in decision making. They use their auxiliary Extraverted Sensing (Se) to act quickly and with awareness of their physical environment; this function also gives them an optimism and ability to live fully in the moment.

You’ll see many ISTPs throughout history and in the arts; people like Samurai author Miyamoto Musashi, Congressman Ron Paul, actor Clint Eastwood, and actress Scarlett Johansson.