" Some friendships develop like flowers in a garden: they are conscientiously planted and nurtured. The ground about them is kept clear of competition. Then, after some weeks and months of incremental growth and laborious pruning, a flower blooms. Such cultivated friendships are agreeable and convenient, if not enduring. Other friendships seem to arise spontaneously, like an egg in a nest or a freckle upon an arm, and these are often mystifying, as both parties are left to wonder how exactly this unexpected affection took hold. "

― , Arm of the Sphinx (The Books of Babel, #2)