Angel and Devil

Ruiwen visited me today (Ruiwen, did you see? I'm writing about you!) from New York during her trip to the bay area. There was a lecture on energy in the afternoon, and Gang called me to invite Ruiwen to the lecture. I told Ruiwen if she went to the lecture, I'd take a nap on the grass when waiting for her. Finally Ruiwen decided to join me in lying on the grass rather than sitting in the hall alone. Later we joked about this, referring it as a dispute between an angel and a devil, with Gang playing the former role and me the later one.

I can't help notice that when Gang and I disagree with each other, I'm always the "devil":

(Scenery One)
"Do you want to take a walk with me?" He asked after dinner.
"No, I'm too full." I answered while touching my full belly.
"Come on, I think you need some exercise."
"I know, but I don't want to take off my pajama."

(Scenery Two)
"I think you should go to talk to alumni to get a job, not play Settlers with computers." He said.
"OK, I'm just lazy." I said when clicking the "trade" button.

(Scenery Three)
"I've had enough pork ribs tonight." Gang said.
"OK, I will have another piece."
"You've already had five."
"OK,OK, this will be the last one." Of course it was not.
...
It's true that Gang has better self-control than me.

It's not that I don't have any self-control, but I always find an angel and a devil fight fiercely deep in my heart. Sometimes I'm tired of playing the role of a good student, or a diligent profession, who has great self-discipline and gets everything organized. Instead sometimes I'd be happily escape from pressures or obligations, and indulge my lazy, weak nature. When I'm facing challenges, I need to energize every cell in my body to overcome them. I love myself at that time, smart and competent; but after that, devil takes my body again and I can be as lazy as a sloth - a cute animal that spends 20 out of 24hrs per day on sleeping and dies mainly because it fails to hold tree branches when sleeping. Sometimes when I look at Gang, I feel like looking into a mirror, but on the reverse side: I simply can't behave that well.

I don't know if it's equally difficult for everyone to fight against desires; at least to me the war is like a mud in which I'm mired down. I need to keep a balance between my "angel" part and "devil" part to avoid driving myself crazy. When the devil is satisfied more or less, it allows me more energy to please the angel; and when the angel is satisfied, it gives me justification to spoil the devil a little bit. But how hard it is to make both of them happy! People talk about indulging their nature while achieving success by doing what they like, and therefore making the angel and the devil agree with each other. But we all know that's rare. Even if you can make a living on something that happens to be your interests, you can't really make achievements until you've acquired relevant skills after all the tough trainings, e.g. no matter how much you like music, you're unlikely to be a great violinist before you've done all the tedious practices for years.

The angel gives you an expected pleasure, while the devil gives the pleasure that can be cashed out right now. Which do you prefer?