I was intrigued to learn recently that Back In The Day (the time of the early Church), the following aspects or elements of the faith were not revealed to converts until after their baptism: the Lord's prayer, the gospel of John, communion, the Theotokos (or something about her, anyway--I'm not clear on that)...
In our consumerist age, we're used to refraining from commitment to anything until we've read all the fine print and know exactly what we're in for in an itemized, guaranteed-or-your-money-back kind of way. Apparently, the journey of faith is not like that. Instead, you are called, and you follow--without knowing much of what's ahead. It's supposed to be unconditional.
How refreshing, how terrifying!