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

This means that if you're going to do something we must choose to be obedient when instructions are given or told and do how it was told to be done, said and performed. In other words, when we choose to be obedient, obedience will never backfire and become that stumbling block because to reach the top of the pyramid we have to CTR. Example, some slacker at any school don't make it to the top of the pyramid because of missing assignments and projects but on the other hand those who Chose The Right got to the to of the pyramid and all because of hard work.