Many seem to experience the same thing as John notes below:
I first heard of Pascal and his Pensees a long time ago when learned about "Pascal's Wager" from this book. I tried to read it, but my say that this "average Catholic guy" was a bit intimidated by the high-falutin' language and put it back down. Yet, I think I'll give it another go.
Pensees can be extremely difficult for a couple of reasons. The language (depending on the translation) can be extremely difficult. More than that, Pensees is a series of largely disconnected thoughts. There doesn't seem to be much structure to it. For this, I highly recommend Peter Kreeft's rearrangement of the material Christianity for Modern Pagans. Kreeft deftly edits the material to make a more-or-less coherent flow-through. If I remember correctly, Kreeft adds some insightful comments after either each Pensee or each group. Unfortunately, I think it may be a sllightly abridged version. But as with his Summa of the Summa it makes for a brief, coherent, introductory presentation.