Lots of times, you just won't understand where your friend is coming from. You'll often take different positions on any given situation, your friend on the emotional side and you on the logical one -- and we all know how hard it can be to reconcile feelings with logic. That will be the task you'll face together, and it won't be an easy one.
This won't be a terribly destructive influence in itself; it simply means you'll both have to try harder than you're used to in order to see your pal for the person they really are. You'll both be projecting all these feelings and ideas onto the other about who they are and what they value, and you won't necessarily be correct. There's nothing inherently wrong with either logic or emotion, however, so if you can find a way for them to work together, you and your pal will both be much stronger than you would be on your own. In fact, that's a good metaphor for the two of you: If you can figure out how to work together, you'll make a lasting friendship.