A mantra to live by

One of my high school biology teachers shared this with our class. We chanted it before exams, and I actually started to believe it. If anyone knows where this mantra comes from, please let me know and I’ll give credit where credit is due!

I am healthy, well and full of energy,
Competent, capable and highly motivated,
Calm, cool, collected and easygoing,
Strong, secure, happy and optimistic,
Intelligent, independent and free!