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.

What a beautiful principle to live your life by. (I was particularly inspired because I have been doing quite a bit of training for my upcoming IPPT – haven’t had an IPPT gold in ages!)

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: