You can do something in life, and maybe be very good at it, but you may not be doing it for a real purpose, but in the wrong way. And of that there is in all the tasks of life. In our churches there are also such people who do something but do not do it for the glory of God, but for their own satisfaction.
First of all, the Bible teaches us that everything must be done for the glory of the Lord:
23 And whatsoever ye do, do it heartily, as to the Lord, and not unto men;
24 Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ.