Our group is working on Borg's book The Heart of Christianity, chapt 10 --nourishment, either literal or verbal.

At a particular moment Borg posits that we should take care not to teach our kids anything they  will have to unlearn later in life.

Friend of mine suggested that:

because knowledge expands so rapidly, it is wellneigh impossible to teach anybody anything they will not have to adjust later on in the light of new knowledge.Whatever you do, don't feel guilty about it.