I first saw the following wonderful quote in a book by Joshua Medcalf (called Hustle), attributed to an anonymous Navy SEAL:
Under pressure, you don’t rise to the occasion, you sink to the level of your training.
PS: A little research brought me to Quora where I learned that the origin of that quote could probably be attributed to the Greek poet Archilochus:
I love to read and write. Professionally, data science, technology, and sales ops are my thing. In my non-professional life, I aspire quite simply to be a good person, and encourage others to do the same. For those who care, I test as INFJ/INTJ (55/45?) in the MBTI.