What you believe must determine how you behave. (Warren Wiersbe, preacher and author)
Why do we do the things we do? What determines our actions and behavior? There may be different influences that cause us to do this or that, but in the end we most often act on the basis of what we believe. When we think something is true, we’ll move in light of that truth. If, on the other hand, we doubt it, we most likely will not act on it.
Don’t let anyone look down on you because you are young, but set an example for the believers in speech, in conduct, in love, in faith and in purity (1 Timothy 4:12).