As evident in Acts 17, there are often constraints imposed upon us by time and other factors. But as circumstances allow, we must offer a systematic and comprehensive presentation of the biblical worldview, and a systematic and comprehensive refutation of the non-biblical worldviews represented by the hearers. Our aim must be nothing short of a complete vindication of Christian claims, and a thorough annihilation of non-Christian beliefs. This may be done over the course of days or even months. And in some situations, it is done over the course of many years, as should be the case in parenting our children. Sometimes we may have only half an hour, but whatever the case may be, we should seek to cover the major points, or to preach "the whole counsel of God" (Acts 20:27, NKJ). As we do this, we must make clear that we are loyal only to the biblical foundation and heritage, and not a pagan foundation or heritage.
Most Christians are not aggressive enough, even if they know something about biblical apologetics and evangelism. We can all take a lesson from the exchange between Elisha and Jehoash: (quotes 2 Kings 13:14-19)
God has given us divine weapons with which to destroy all non-Christian religions and philosophies (2 Corinthians 10:3-5). These are spiritual or intellectual weapons, expressed in our preaching and arguments. But what are we doing with them? As Elisha was angry with Jehoash for not being aggressive and thorough enough, so this man of God would be very angry with most of us today. He would have no patience for our tolerance and propriety.
Nevertheless, God is faithful to himself and to his people, and he has preserved some of us who have not bowed the knee to relativism, pluralism, and other non-biblical perspectives. We who know our God will do great things in his name. We will ceaselessly attack non-Christian religions and philosophies with biblical argumentation and persistent prayer. We will strike them again and again. When they run, we will pursue them; when they hide, we will expose them; and when they fall, we will trample them. We will not make Jehoash's mistake, who struck three times and stopped we will never stop. When we finally learn to fight by the sword of the Spirit, which is the word of God, we will find that non-Christian thought has no defense against our assaults. We will be an invincible army, and the very gates of hell will not stand against us.