I agree with the quote, indeed with time and experience we learn to be humble since we then realize how much effort it takes to make money, but during quick profits, we kind of think that it is us who are geniuses who have special abilities to make profits all the time leading to ego. Part of it is true, we are all special and unique and have our own talents and abilities, but we need to be humble enough to understand that it takes a lot more than that to sustain and gain wealth if we want to make it a profession and experience is something that refines us.