I’m normally a person who goes above and beyond what’s asked of me. I like to say, “If it has my name on it, it has to be excellent because I represent more than myself.” However, sometimes i don’t give my best effort if I don’t understand the purpose of what’s being asked of me or feel like it’s not a productive use of my time. Several years ago my wife asked me to take the remote control to the cable company to exchange it. I had never noticed a problem with it, but i went anyway. When I arrived, I grabbed the remote to go in and it lit up. I thought, “What am i going to tell these people as to why i need a new one? It looks like it works.” So I took it back home. A few days later when it acted up on me, I had to admit I didn’t return it.
There are a lot of things we do in life that may feel pointless. There’s times when God puts in on our heart to do something for others that doesn’t make sense. In fact, a lot of what it takes to live out our faith daily can be exhausting or feel unproductive. We don’t always see the point. That should never stop us from being obedient to what God asks. In 2 Kings 3, the two kings of Israel and Judah decided to attack Moab. They took the desert road to remain undetected. The men were thirsty and about to die. They called on Elisha who told them to dig trenches all night. He then said, “For thus says the LORD, ‘You will not see wind or rain, yet that valley will be filled with water, so you and your cattle and your other animals may drink” (AMP). The next morning they woke up to water in the trenches and were victorious in battle.
They didn’t understand God’s reasons. They were exhausted, yet they did what was asked and God rewarded them. That principle holds true for us. 1 Corinthians 15:58 says, “Therefore, my beloved brothers and sisters, be steadfast, immovable, always excelling in the work of the Lord [always doing your best and doing more than is needed], being continually aware that your labor [even to the point of exhaustion] in the Lord is not futile nor wasted [it is never without purpose].” You may not understand why God wants you to do something, but do it anyway. You may feel exhausted and not up to it, but do it anyway. You may feel like it’s a waste of time, effort and energy, but do it anyway. Nothing you do for God is wasted or unproductive. God is working behind the scenes on your behalf and your blind obedience is often the preparation for a miracle.
Devotions by Chris Hendrix 
I’ve noticed, more times than not, when God wants me to do something many reasons not to do it pop up. Like you said, this is when we need to do it anyway. A pastor of mine used to say, “Obedience is when you DO.” Blessings
I like what your pastor said. Such truth!