From Chapter Seven, Why You Don't Have to Keep Getting Transformed All the Time: Or, How Virtues Make a Lasting Change in Us.
Genuinely life-changing experiences lead to something more lasting. The key example is conversion to Christ, which changes our lives not because it's such an intense experience -- lots of good Christians never have an intense conversion experience -- but because it begins the life of faith, in which you are united to Christ, our Bridegroom. Conversion can be a lot like falling in love, leading to the one Christian marriage that is at the basis of all marriage: union with Christ. By the same token, just as falling in love is not necessary to a good marriage, no particular experience at all is necessary for faith in Christ. What matters is believing that his word is true, just like what matters in marriage is believing and keeping the promises you make in your wedding vows.
Nor is it especially important, in either case, to "keep the feeling alive." Feelings come and go -- that's what they're for. They change all the time, because they are about responding to the immediate situation. But over the course of a lifetime they do tend to settle into predictable patterns, such as are found in the virtues and blessings of a good marriage.
