I think, as you're growing up, your emotions are just as deep as they are when you're an adult. You're ability to feel lonely, longing, confused or angry are just as deep. We don't feel things more as we get older.
Nothing is more dangerous than a friend without discretion; even a prudent enemy is preferable.
To appreciate and use correctly a valuable maxim requires a genius; a vital appropriating exercise of mind closely allied to that which first created it.