Evangelism and apologetics are twin pillars upon which the outreach of the church is built. The two may be and must be distinguished, but they ought never be separated. They form a two-pronged attack against the fortress of hell and a double-front of defense against the onslaught of paganism... In history the task of apologetics has progressed to include both the defense of the Gospel against the attacks of alien philosophies and religions, and the positive construction of full-fledged Christian philosophy. In this regard apologetics serves the church not only in pre-evangelism, but in post-evangelism as well. It helps the believer counter the objections that are faced in a myriad of settings. It arms and equips the saints for the task of ministry. God has ordained both evangelism and apologetics, and the obedient church is faithful to both tasks.
R.C. Sproul, Tabletalk. Cited in Worldviews, the Newsletter of the Apologetics Resource Center, May/June 2004