I’ve come across G K Chesterton as someone who made various pithy comments, but someone has been kind enough to compile a list of good ones. A few which made me think:
Christianity has not been tried and found wanting; it has been found difficult and not tried.
We make our friends; we make our enemies; but God makes our next door neighbour.
The only good argument against Christianity is Christians.
The Bible tells us to love our neighbours, and also to love our enemies; probably because generally they are the same people.
And one which made me laugh:
The poets have been mysteriously silent on the subject of cheese.
Further reading for the really dedicated: http://en.wikiquote.org/wiki/G._K._Chesterton