Feelings, relations, or whether say it emotions, if not conveyed; they are left hidden somewhere, far away from this world.
Some are good at speaking it out, some are not. The introverts especially find it quite difficult to say it out. So they take the help of a " pen and paper" , pour it down into words through the flowing ink of pen, spilled up onto the paper. The pure soul of paper, just gets drapped into the midst of emotions, the feelings and much more beyond that. Writing is not just the flow of words, it's the flow of soul onto the pure blank soul ready to accept what ever you want to pour in without any hesitation.