Sometimes one sentence can say it all.  From Hans urs Von Balthasar:

What is uniquely Christian begins and ends with the revelation that the infinite God loves the individual man infinitely.

Speaking of one sentences, I came across this attempt by a protestant woman to summarize each of the books of the Bible in one sentence, actually by one verse from the book (a little more challenging to do).  If you’re interested, you can peruse her attempt here.