Relevant Words of God:
Fulfilling your duty is the truth. Fulfilling your duty in God’s house is not simply fulfilling some obligations or doing something you should do. It is fulfilling the duty of a created being living between heaven and earth! It is fulfilling your obligations and responsibilities before the Lord of creation. These responsibilities are your true responsibilities. Compare fulfilling the duty of a created being with being filial to your parents—which is the truth? Fulfilling the duty of a created being is the truth; it is your bounden duty.
from “What Is the Reality of the Truth?” in Records of Christ’s Talks
Your duty is not managed by you; it’s not your own enterprise or your own work. It’s God’s work that requires your cooperation, thus giving rise to your duty. God’s management work has been carried out up to this very day, and the portion that people must cooperate in His work is man’s duty. No matter what kind of duty you are performing, it is not your own enterprise or your personal business. It is the work of the house of God, it forms one part of God’s management plan, and it is the commission God has given to you. So then how should you treat your duty? …
In performing your duty you must first seek out God’s requirements. Performing your duty is not selecting your personal preferences or doing whatever you would like to do, and it is not doing whatever you are happy and comfortable doing, or whatever will make you look good. If you forcefully impose your preferences on God or practice your own preferences as if they were the truth, observing them as if they were the principles of the truth, then isn’t that wrong? That is not fulfilling your duty and performing your duty in this way will not be remembered by God.
from “Only by Seeking the Principles of the Truth Can You Perform Your Duty Well” in Records of Christ’s Talks