As a believer in Jesus Christ, you are of the opinion and testimony that there are absolute truths in the world. For example, God exists and Jesus is His Son. Most parents feel the responsibility to share said truths with their offspring.
As a missionary of The Church of Jesus Christ, you believe one of those absolute truths is the restored gospel.
As a parent of a 17 year-old teenager, you believe an absolute truth is to avoid premarital sex, or drugs, or alcohol or any number of harmful activities and behaviors.