Understanding the meaning of serving the Lord with a perfect heart and a willing mind can be very difficult because we naturally want to do good, not necessarily to please God but for our praise. We feel good when we are commended for what we have done and quite often forget that its God who gives us the opportunity and the inclination to do what is right. As long as we take credit for ourselves, we are not serving God but our interests.
Therefore a good knowledge of the word of God, gained from a careful study of the Bible and devoid of denominational presuppositions will help us understand service with a perfect and willing heart as spoken of by David in 1 Chronicles 28:1-10. Find this knowledge at amazon.com/dp/B00BFOEAWY.