I tend to quote most from the synoptic gospels (Matthew, Mark, and Luke). I find John lovely, but already containing theology. The synoptics are beautiful in their simplicity and give me clear goals to strive for in my attitude and behavior. I especially like the beatitudes and the parables.
I enjoy Proverbs a lot- tons of good advice in there, just as one would expect. Psalms can be lovely, though I confess I have little use for all the ones about smiting one's enemies. Paul's epistles contains some of the things I find most beautiful and meaningful and also some of the things that I struggle to understand. Paul is very complex.
Stuff that I struggle with...
Revelation. First, it's loaded with symbolism. Second, every conservative/fundamentalist church I went to interpreted it differently. Third, I later found it just did nothing for me. I'm not saying it is that way for everyone, but it's just not very relevant to my life. The way I see it- I am supposed to live in a Christ-like manner as much as possible, and I should be engaged in an attitude that reflects the fruits of the Spirit. My potential is to take up and carry the cross, to heal, to love, to serve... with joy, peace, love, compassion, understanding, gentleness, humility, etc. If I'm doing that, it really doesn't matter if the world is ending. I'll do it each day until I die or the world ends. So what's the difference? I just don't get it.
Numbers. Oh, Numbers. It drops me off to sleep. I try, I really do. But there are some *dense* passages in there!