Early on in the days of this website, I had a post defining rationalism, which is linked on the right. However, since many readers have joined since then, I thought it would be worthwhile to discuss it again - this time in a little more detail, and to contrast it with its opposite. My goal with this description is to leave the definition of rationalism sufficiently vague to include both medieval rationalists and contemporary rationalists; in a future post, I plan to spell out the differences between the two. Note that my use of the word "rationalism" is not identical to the dictionary definition, but I feel that my definition (adapted from that of Rabbi Dr. David Berger) is more useful in a Jewish context. Note too that I am using the antonym of "mystic"; it's not ideal, but it's the best I could come up with. And remember that these represent two ends of the spectrum, but there is a vast range of possibilities in between.