"When obedience becomes our goal, it is no longer an irritation; instead of a stumbling block, it becomes a building block."
This statement means that when you get used to being obedient and listening to what others tell you, you will no longer get mad and you will have a happy long life, because you will always be choosing the right thing to do and you will be a good person in life. That is personally what I think that this quote means, other people can think other things but that's just what I think and my opinion.And that is what most people would agree that it means.