His father watched for a while, then came to his son and said, “You need to use all your strength to move a rock this large.”This quote from Conference reminds me that all my strength includes those around me that willingly offer their strength to me in doing good. I can call on them and they will happily give their effort and heart and soul to my cause. And me to them.
The boy responded, “I have used all my strength!”
His father corrected him: “No you haven’t. You haven’t had my help yet!”
They then bent down together and moved the rock easily.
("Drawing Closer to God" Elder Terence M. Vinson, Oct 2013)
Maybe this is what the Savior was referring to when he said, "Howbeit this kind goeth not out but by prayer and fasting." (Matt 17:21) We must draw our will to His through prayer and fasting. Tap into power beyond our our own. Then we can cast out the demons in our lives.
It also means that we take the following kind of oath.
Art thou a brother or brethren? I salute you in the name of the Lord Jesus Christ, in token or remembrance of the everlasting covenant, in which covenant I receive you to fellowship, in a determination that is fixed, immovable, and unchangeable, to be your friend and brother through the grace of God in the bonds of love, to walk in all the commandments of God blameless, in thanksgiving, forever and ever. Amen. (D&C 88:133)-