The Unscientific way of judging whether something is True or not, is to let your feelings decide for you. The catastrophic danger of this method is that your feelings are influenced by what you want to be true. It is also easier for me to convince you that something is True if I know how to manipulate your feelings.

The Scientific way of judging what is True or not is to let the facts convince you. Observable, testable, repeatable facts.

"It is difficult to get a man to understand something when his salary depends on his not understanding it." -Upton Sinclair