Upton Sinclair said "It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" Another way to put it is tha

Upton Sinclair said "It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" Another way to put it is that it is difficult to get a man to believe something when everyone one he loves and respects does not believe it. I think that was the explication being provided.