It is not expected that you go through life without making mistakes, but you will not make a major mistake without first being warned by the promptings of the Spirit. This promise applies to all members of the Church.
Some will make critically serious mistakes, transgressing the laws of the gospel. Here it is time to remind you of the Atonement, repentance, and complete forgiveness to the point that you can become pure again. The Lord said, “Behold, he who has repented of his sins, the same is forgiven, and I, the Lord, remember them no more.
If the adversary should take you prisoner due to misconduct, I remind you that you hold the key that will unlock the prison door from the inside. You can be washed clean through the atoning sacrifice of the Savior Jesus Christ.
You may in time of trouble think that you are not worth saving because you have made mistakes, big or little, and you think you are now lost. That is never true! Only repentance can heal what hurts. But repentance can heal what hurts, no matter what it is.
If you are slipping into things that you should not slip into or if you are associating with people who are pulling you away in the wrong direction, that is the time to assert your independence, your agency. Listen to the voice of the Spirit, and you will not be led astray.
I say again that youth today are being raised in enemy territory with a declining standard of morality. But as a servant of the Lord, I promise that you will be protected and shielded from the attacks of the adversary if you will heed the promptings that come from the Holy Spirit.
Dress modestly; talk reverently; listen to uplifting music. Avoid all immorality and personally degrading practices. Take hold of your life and order yourself to be valiant. Because we depend so much on you, you will be remarkably blessed. You are never far from the sight of your loving Heavenly Father.
The strength of my testimony has changed since I felt a need to lean on the testimonies of my seminary teachers. Today I lean on others when I walk due to age and childhood polio but not from doubts regarding spiritual matters. I have come to believe, to understand, and to know the precious truths of the gospel and of the Savior Jesus Christ.
As one of His special witnesses, I testify that the outcome of this battle that began in the premortal life is not in question. Lucifer will lose.
Boyd K. Packer, “Counsel to Youth,” October 2011 General Conference