One of the essential principles of critical thinking is the caveat, “Consider the source!” It warns us to ask the following questions. How credible is the source of information that I use? What is the potential for bias? And, is the source potentially self-serving?

I was reminded of this as I read a recent letter to the DN-R (“Humana Right, AARP Wrong,” Oct. 14). The writer believed arguments by Humana (a for-profit health insurance company which opposes a public insurance option) and said AARP was lying. AARP is a non-profit association that promotes the welfare of senior citizens. Consider the source. Who would you choose to believe?

Health care reform that includes a public option is also supported by Consumers Union, the nonprofit organization that publishes Consumer Reports. Its analysis shows that reform legislation that includes a public insurance option is essential to reducing the cost of health care for all Americans.

Use reliable sources and learn the facts.