Your ideals in life will conflict and you won't both be able to express your own at the same time that your friend is asserting theirs. You're naturally more accepting of ideas that involve speculation and intuition, and you'll have a hard time explaining these to your pal, who will insist on proper proof. When you can't give it -- after all, who can prove the intangible, like love, hope or faith?
-- you may start doubting yourself and your beliefs. On the other end of that dynamic will be your friend, who will think they have a very good reason for challenging your ideals -- in their mind, your ideas are baseless, as if they have no foundation in anything that can be properly trusted, much less understood. To your friend, that will translate as worthlessness. Their ideals have been developed through careful weighing of the alternatives and consideration of all angles, so they tend to distrust anything that involves 'gut reactions' or anything else that's hard to put their finger on. But their perspective denies an entire facet of human experience. You two will have a hard time communicating the importance of your own points of view, because you won't be able to respect each other's. And you, in particular, may feel invisible in this friendship.