From Kingdom, Grace, Judgment:

This chapter, however, is running the danger of becoming nothing but a series of long, slow curves, so let me end it with one pitch right to the strike zone….What saves us is Jesus, and the way we lay hold of that salvation is by faith. And faith is something that, throughout this book, I shall resolutely refuse to let mean anything other than trusting Jesus. It is simply saying yes to him rather than no. It is, at its root, a mere “uh-huh” to him personally. It does not necessarily involve any particular theological structure or formulation; it does not entail any particular degree of emotional fervor; and above all, it does not depend on any specific repertoire of good works–physical, mental, or moral. It’s just “Yes, Jesus,” till we die–just letting the power of his resurrection do, in our deaths, what it has already done in his.

My purpose in saying this so strongly, however, is not simply to alert you to some little band of intellectuals called theologians who may try to talk you into thinking otherwise. Such types exist, of course, but they are usually such bores that all they do is talk you out of wanting even to breathe. No, the reason for my vehemence is that all of us are theologians. Every one of us would rather choose the right-handed logicalities of theology over the left-handed mystery of faith. Any day of the week–and twice on Sundays, often enough–we will labor with might and main to take the only thing that can save anyone and reduce it to a set of theological club rules designed to exclude almost everyone.

Christian theology, however, never is and never can be anything more than the thoughts that Christians have (alone or with others) after they have said yes to Jesus. Sure, it can be a thrilling subject. Of course, it is something you can do well or badly–or even get right or wrong. And naturally, it is one of the great fun things to do on weekends when your kidney stones aren’t acting up. Actually, it is almost exactly like another important human subject that meets all the same criteria: wind-surfing. Everybody admires it, and plenty of people try it. But the number of people that can do it well is even smaller than the number who can do it without making fools of themselves.

Trust Jesus, then. After that, theologize all you want. Just don’t lose your sense of humor if your theological surfboard deposits you unceremoniously in the drink.