"When obedience becomes our goal, it is no longer an irritation; instead of a stumbling block, it becomes a building block." - James E. Faust

The meaning of this quote means that, when we don't have obedience we have a stumbling block meaning our block isn't getting good its going bad, it's destroying into little pieces. but if we have obedience our stumbling block will become a building block, when we keep obedience, we're reaching the good, our goal. stumbling is an irritation but building won't be irritating anymore. we must keep obedience. the more obedient you are, your block will get higher and higher.