A lot of people claiming something is their calling may be bullshitting themselves. A lot of people claim that they were meant to only do something throughout their life but in reality, never went after it. Or they may go after what they think is their calling and come to find out they are not that good at it. What Rich wants people to know is they should definitely go after what they think their calling is but also keep an open mind because they mind something else that they like better along the way.