Anyone telling you to follow your passion is already rich. No one grows up thinking: "I'm passionate about tax law", but the best tax lawyers fly private jets and have a much broader selection of mates than they deserve.

According to aero-propulsion engineering, most of a plane's fuel is burned when it is taxi-ing and taking off, not when cruising in mid air. Any new venture needs to overcome an initial resistance in order to achieve a breakthrough.

Education teaches us to be compliant, older people tend to bring up unheathy comparisons, and learning to stay humble.