Blaise Pascal was an early 17th century French mathematician and philosopher. He was a Christian, and died pretty young, not even 40 years of age. He was working on a book regarding the defense of the Christian faith, but never finished it.
After his death, his writings were gathered and organized into a book called Pensées, which basically means "Thoughts". Some of his writings are pretty profound, such as this paragraph:
434 The chief arguments of the sceptics--I pass over the lesser ones--are that we have no certainty of the truth of these principles apart from faith and revelation, except in so far as we naturally perceive them in ourselves. Now this natural intuition is not a convincing proof of their truth; since, having no certainty, apart from faith, whether man was created by a good God, or by a wicked demon, or by chance, it is doubtful whether these principles given to us are true, or false, or uncertain, according to our origin. Again, no person is certain, apart from faith, whether he is awake or sleeps, seeing that during sleep we believe that we are awake as firmly as we do when we are awake; we believe that we see space, figure, and motion; we are aware of the passage of time, we measure it; and in fact we act as if we were awake. So that half of our life being passed in sleep, we have on our own admission no idea of truth, whatever we may imagine. As all our intuitions are then illusions, who knows whether the other half of our life, in which we think we are awake, is not another sleep a little different from the former, from which we awake when we suppose ourselves asleep?
Pascal, in working on his defense, basically busts the bubble for the humanist and the atheist. In their blustering insistence on "Science" and "Reason", they have no possible way to know for sure that all they hold so real is not in fact a thin, pale, watered-down version of a much deeper and richer reality which they will taste once they awaken from this present "dream". Either that or they awaken to eternal torment far darker and far more agonizing than anything in this present age.
The whole book is filled with these sorts of thought-provoking illustrations and musings. I'd urge all Christians to add this to their bookshelf, and considering the book is free online, why not?
Pensées is entirely in the public domain; you can get it for free online at Project Gutenberg. They have plain text, Kindle, and more.