"It is difficult to get a man to understand something when his salary depends upon his not understanding it." -- attributed to various sources; see for example

"It is difficult to get a man to understand something when his salary depends upon his not understanding it." -- attributed to various sources; see for example: https://quoteinvestigator.com/2017/11/30/salary/ https://quoteinvestigator.com/2017/11/30/salary/