When we understand our nature and our purpose on earth and that our bodies are physical temples of God, we will realize that it is sacrilege to let anything enter that might defile the body. It is truly irreverent to let even the gaze of our precious eyesight or the sensors of our touch or hearing supply the brain with memories that are unclean or unworthy. We will cherish our chastity and avoid “foolish and hurtful lusts, which drown [us] in destruction and perdition.” We will “flee these things; and follow after righteousness, godliness, faith, love, patience, [and] meekness”—traits that edify the whole soul.
President Russell M. Nelson, "Your Body: A Magnificent Gift to Cherish", New Era, August 2019
When I read this talk, what stuck out to me is that I need to understand my divine role and nature in being a part in Heavenly Father’s plan. I have a purpose for being here. I have a part to play. I am here for some specific reason.
My job is to understand what that is. Why? Why at this time? Why do I have what I have? Why did I come here to where I am? Who was I before this earth? Who was I up there in the pre-mortal world?
Once I understand that, it will be easier, at least less difficult, to make eternal things a priority. When we face a cliff, we don't jump off. We don't because we know the dangers in doing so. That would be harmful in many ways. That would be dumb. Likewise, we will know without a doubt that putting something into our bodies and minds that is not good or contrary to God's will, would be dumb. We just won't jump.
Sometimes, when the consequences are not immediate, like from jumping off a cliff, we don't put that much emphasis on. Even when the consequences are far worse than physical death. Spiritual death just doesn't happen immediately.
I will seek to know my reason, my purpose, for being here, and now, at this time. As I understand more, I will be more cognizant of what I take into this mortal body, which was made for me specifically. At this point in His plan, everything that is given to me, is on loan. It isn't mine. The better I understand that, the more selfless I will be.