Neal A Maxwell in his book 'Men & Women of Christ' said:
"We can ease the stress caused by our inconsistency, pain through which we put ourselves repeatedly. Unfortunately, like Oliver Cowdrey, we do not always "continue as [we] commenced" (D&C 9:5). As with our wasteful automobile driving habits that consume extra energy because of quick starts and stops, so it may be with inconsistent discipleship we actually inflict costs on ourselves in the face of divine counsel."
It's hard to keep the momentum of change going sometimes isn't it. Sometimes we try to run faster that we are able, which leaves us too tired to complete the journey as we had planned. To be a consistent disciple we need to run as fast as 'the Lord' knows we need to run, and just as we would regularly service our cars, so we need those regular spiritual tune-ups too to keep our engine in tip-top condition. It's the only way we won't 'become weary and faint' on our journey.
I hope you will be full of energy today - if not physically, spiritually!