true-spiritual north guidance for children:
you can read the context and background for the first poster as well as how the second poster came to be; along with lots of interesting discussion linked here.
as parents, without a doubt, we stress the importance of keeping the commandments. we discuss the consequences of sin and bad choices. but we are just as quick to point out that we love our children and that if they make a mistake - big or small - that we are there for them and will help them use the Atonement of Jesus Christ. in fact, we stress just as much that they will always have the chance to repent and to turn to Christ - no. matter. what.
i agree with one of the commentors ... the only person in the not-even-once club is Jesus Christ.