If you had to read a holy book outside of the Bible?

As far as religion goes, I'm Catholic. But I absolutely love learning about different religions, especially ones that teach unconditional love at their core. (Though admittedly, many are twisted and used to justify violence and atrocities towards one another). I've, of course, read the Bible, and I am currently reading the Koran and the Torah, and there are many wonderful things in all three, but I was also curious as to what other holy books are spiritually positive and inspiring as well. Any suggestions? Please don't post just to say something nasty about religions. I would like real, honest, helpful opinions