Perhaps the most important obedience God requires from us is the obedience in the difficult missions, and He gave us an example by the obedience of all the other creatures.
We may be pleased and rejoice when God sends us to deliver joyful tidings and in us are fulfilled the words of the Holy Bible: "How beautiful are the feet of those who preach the gospel of peace and bring glad tidings of good things" (Rom. 10: 15). We rejoice for those missions for the vain-glory we gain through people's praise and thanksgiving. As for the difficult missions they are burdensome to us, and when we carry them out, we do that for the sake of God alone.