The combination of your spirituality and your friend's philosophical side could be a heady experience for you both, but things could also get out of hand if you let them. You'll stimulate their idealistic nature in a big way; when they're around you, they'll feel as if their philosophies are suddenly becoming reality, and anything is possible. There's a troublesome side here, though.
Neither one of you will realize at first that your spiritual philosophies don't match up as well as you think they do. Keeping a grip on reality and attainable goals will be difficult in this relationship, but it will be essential. Talk out your values and beliefs in an honest, forthright way, and make sure you're as strong of a match on that level as you think you are. And try not to be disillusioned when you find that you're not!