Be concerned with HOW your children think, not telling them what they should think. Or something to that effect. But investigation and curiosity should be taught, and telling your kids what to think instead of giving them the tools to decide is doing them a disservice.

That sentiment might have been my favorite part of any of the letters in this collection, outside of him saying several times over to various people that that science and religion don't have to be mutually exclusive, and also that you can't use things that aren't proven ("because that's just how it is")to try to explain things that can be proven (like, all of science so far, basically). And in today's climate in the US, I wish I could plaster that on every billboard everywhere.

I like that he never outright poopoos what people believe, though, and instead explains to them how it's okay to ask questions and ask for proof. My dad taught me the same, so maybe that's why I'm drawn to this way of thinking.