I used to be a Catholic. I left because I object to conversion by concussion. If you don't agree with what they teach, you get clobbered over the head until you do. All that does is change the shape of the head.

The quote "I used to be a Catholic. I left because I object to conversion by concussion. If you don't agree with what they teach, you get clobbered over the head until you do. All that does is change the shape of the head." by Alan Alda is a witty yet critical reflection on dogmatic belief systems and the pressure to conform. Alda, an acclaimed actor and writer known for his role in MASH*, often uses humor to tackle serious topics. In this case, he critiques religious rigidity and the tendency of some institutions to enforce obedience through fear or force rather than through understanding.

The phrase "conversion by concussion" is a metaphor for coercive indoctrination—the idea that if someone doesn't align with a certain doctrine, they are pressured, shamed, or punished until they submit. Alda suggests that such tactics don't foster true belief or spiritual growth; instead, they merely force outward compliance, symbolized humorously by “changing the shape of the head.” This speaks to the loss of individual thought in favor of institutional control.

By stating he “used to be a Catholic,” Alda shares a personal decision rooted in a desire for intellectual freedom and authenticity. His criticism isn't necessarily about Catholicism alone, but about any environment—religious or otherwise—that suppresses questioning and critical thinking. The quote captures a broader philosophical stance: that beliefs should be arrived at freely, not imposed under threat of exclusion or punishment.

Ultimately, Alda’s quote is a defense of personal integrity and the right to question authority. Through sharp humor and candid reflection, he emphasizes that true conviction must come from within—not from the pressure to conform, but from a journey of individual exploration and understanding.