A maxim in this field is, there is nothing new but history we do not know.
All successful battle field commanders cannot do without a firm spiritual faith.
80/20 Rule: If you are sure about 80% of your business or If you are sure about your business 80% of the time, you are okay. Or else, you need to do something about it, such as building a system to run your business, delegating more, or even breaking it up into smaller, more manageable pieces, etc.
Shall we teach kids change and volatility, or stability, history and the First Principles?