One last word. I have found that nothing is more dangerous to one’s own faith than the work of an apologist. No doctrine of that Faith seems to me so spectral, so unreal as one that I have just successfully defended in a public debate. For a moment, you see, it has seemed to rest on oneself: as a result, when you go away from that debate, it seems no stronger than that weak pillar. That is why we apologists take our lives in our hands and can be saved only by falling back continually from the web of our own arguments, as from our intellectual counters, into the Reality — from Christian apologetics into Christ Himself. That also is why we need another’s continual help — oremus pro invicem [‘Let us pray for each other’].
C.S. Lewis, "Christian Apologetics" (1945) included in God in the Dock (Eerdmans, 1970) 101.