Note: As the Church has said, the manual has been prepared as the primary source of lesson material. These supplements, from general conference addresses, are meant only as a complement to your study on this lesson’s topic.
Supplement is from President Henry B. Eyring's talk, "Faith and the Oath and Covenant of the Priesthood" from the April 2008 general conference priesthood session:
You may at times need reassurance, as I do, that you will have the strength to meet your obligations in this sacred priesthood. The Lord foresaw your need for reassurance. He said, “For whoso is faithful unto the obtaining these two priesthoods of which I have spoken, and the magnifying their calling, are sanctified by the Spirit unto the renewing of their bodies.” I have seen that promise fulfilled in my own life and in the lives of others. A friend of mine served as a mission president. He told me that at the end of every day while he was serving, he could barely make it upstairs to bed at night wondering if he would have the strength to face another day. Then in the morning, he would find his strength and his courage restored. You have seen it in the lives of aged prophets who seemed to be renewed each time they stood to testify of the Lord Jesus Christ and the restored gospel. That is a promise for those who go forward in faith in their priesthood service...
My prayer is that you will decide tonight, and then every day, to go forward in faith in keeping your covenants with God and so claim the promise He has made to you with an oath. You can do it in simple things. When you meet with your quorum, you can decide to see them as brothers in the family of God. There will be someone in your quorum or priesthood group who is in need. He may not show it. You may not be able to see it with your eyes. But God knows and invites you to be His servant in helping him.Read the full talk, "Faith and the Oath and Covenant of the Priesthood" by President Henry B. Eyring.