Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving.
We all must work to make a living. The word of God says to work with all your heart as if you are working for the Lord. When it says with all your heart, that means you give it all. Don’t cut corners or skip. Be excellent at what you do and give your best to God. Also be mindful of the state of your heart and attitude.
As Christians, our reward comes from the Lord. Our reward on earth may be the peace of mind or encouragement from your peers or even a promotion. Work hard and encourage others as well. Let your work ethic be the reflection of your faith.
Make sure to put God first. If you overwork and try to get reward from your human masters, you might be making your work as an idol. Matthew 6:21 says, for where your treasure is, there your heart will be also.
The purpose of your work is to show that Christ is at work in you.