"There is not a man or boy in this vast congregation tonight who cannot improve his life. And that needs to happen. After all, we hold the priesthood of God. If we are boys who have received the Aaronic Priesthood, we are entitled to the ministering of angels to guide and direct, to bless and protect us. What a remarkable and wonderful thing that is. If we have had conferred upon us the Melchizedek Priesthood, we have been given the keys of the kingdom that carry with them eternal powers. These were spoken of by the Lord when He laid His hands upon the heads of His disciples."
Ref. (Gordon B. Hinckley, "Rise Up, O Men of God," Ensign, Nov. 2006, 60)
One thing to consider about the power of the Priesthood is that the strength of the ordinance being performed is not only a reflection of the worthiness of the Priesthood holder but also the faith of the recipient. If the recipient has no faith that the ordinance will bless them than it will not.
"The Church of Jesus Christ is a church of priests, 'a royal priesthood, an holy nation' (1 Peter 2:9).
"The restored Church gives to each home a priesthood holder with the power of God to bless. How many times I have been able to hear the soft, sweet voice of a little child at home say, 'Daddy, could you give me a blessing?' and put my hands upon his or her head in moments of pain and difficulty and pronounce blessings of comfort and healing and see the power of the priesthood exercise its influence and the next day hear that little voice say, 'Thanks, Daddy, I slept just fine last night.' We don't need to go out looking for someone having that power--it is among us! What a blessings to be able to teach this principle to our children! This is the only church upon the earth which offers such a blessing to families.
"Through this power, I was able to ordain each of my sons to the priesthood and thus give them the power of God to administer His ordinances. ". . . This is . . . why I am a member of this Church: because the power of the priesthood is again upon the earth and has reached even unto our homes.""
Ref. (Enrique R. Falabella, "Why Are We Members of the Only True Church?" Ensign, Nov. 2007, 14-15)