Don't try to turn your passion into a job or pay for private school, says business guru Scott Galloway

• Scott Galloway warned against following a passion, betting the farm, and paying for private school.
• The NYU marketing professor and "Pivot" co-host said rejection is inevitable on the path to success.
• Here are Galloway's four key arguments from a recent podcast.

Almost nobody should try to turn their passion into a career, bet the farm on a single investment, expect to escape rejection in life — or pay for private school, says Scott Galloway.