Cranberries are a deceptive fruit.  They look so sweet and tempting, yet when consumed are bitter to the taste.  Not all is as it seems in your world.  Have you not heard of a wolf in sheep’s clothing?  Why is this?  Because the physical world is one of duality:  hard and soft, sweet and bitter.  There is great purpose in this.  Once you have tasted sweetness, you will spend a lifetime searching for more of it, eschewing bitterness along the way. 

Yours is a world of trial and error.  You will try the fruits of the physical realm one by one until you find the most sweet and ripe.  That is why you are there.  Do not bemoan the bitter fruits, for they propel you ever onward, ever upward, knowing that something far sweeter yet exists, and this is true.  This is true at the micro level and at the macro. 

The Sweetest Fruit is yet to be tasted.  Never lose faith in this fact.  It is yours for the taking, but you must keep reaching higher, knowing that the journey for now may be bittersweet.