"What are feelings? What is subconscious? If a person is deaf, blind, mute since birth, would he still have 'feelings'?"
Feelings are how we define our relationships with things, with others around us based on experiences gained overtime with the help of our senses...So our deaf-blind-mute friend would still have feelings based on sensations...He'll still love "a tender touch, a fragrance and he'll still fear the burn"...Now if you say that what if he doesn't have any senses at all...Are you talking about some vegetable? Yes in that case, he'll have no feelings.
And subconscious is nothing but that suppressed part of your mind which you had started neglecting and gradually you forget that it was only a part of your very consciousness a few years ago.
And what do you think about "feelings are governed by the heart"?
Feelings are also a function of our mind. The problem arises, when you start acting purely on your feelings, taking them as a substitute of Mind, and saying and actually believing such mindless maxims like "feelings are governed by the heart". Heart's function is not to govern or control the feelings or any such thing. All this crap associated with it is the doing of those who just won't accept the simple fact that A is A. That’s what I think. If only we leave the poor little hard-working organ to do its job and appreciate it just for that, half the miseries of this world will go like there never were.