Good conduct can only come from good desires, for what the heart loves, the will chooses and the mind justifies as the right thing to do. Consequently, any measure of holiness expressed by fallen humanity must first come from the Holy Spirit inspiring in us a longing to be godly and empowering us to follow through on the same.
Through the Bible, God not only teaches us what we should consider wholesome and holy, but he also supernaturally uses scripture as his instrument to turn our hearts to want to act accordingly. Scripture is the primary way the Holy Spirit speaks to us until he decides to just… speak to us. This can be orally, by some incident, some commercial, a billboard, or a dozen other ways.
“Nevertheless, I tell you the truth: it is to your advantage that I go away, for if I do not go away, the Helper will not come to you. But if I go, I will send him to you. And when he comes, he will convict the world concerning sin and righteousness and judgment concerning sin, because they do not believe in me; concerning righteousness, because I go to the Father, and you will see me no longer; concerning judgment, because the ruler of this world is judged.” Jesus