You can’t live by just one. If I were to pick I would say belief that way you will know the outcome since the belief is always the same. You never second guess when you go with the belief. Acting on emotions can work well like in couples interacting lovingly doing things to show they care. Making decisions based on emotions like hurt, jealousy, and anger are often the wrong choice and can make things worse. It can be hard but try and not say things that are emotionally charged until you have calmed down and can think then try and resolve the issue without raising voices and anger.
Reason is not something I would live by on its own. Doing things by reason and belief make for a very boring robotic person. Being able to reason and figure things out is what makes some people very good at certain professions. A mechanic has to eliminate what isn’t wrong when he tries to fix a car. Through his reasoning skills and tools he can eliminate the fuel filter, fuel injectors, spark plugs, distributor cap, and wire The mechanic has reasoned so far it is something in the catalytic converter. Emotion couldn’t of solved the catalytic converter. You might have an idea whats wrong with a car but you have to reason and figure out how to get to the defect and then how to take the car apart to get the broke part then remember how it goes back together. Living by belief can be dangerous . Some beliefs are good. Be a good person. Help others. Some beliefs hold you back like racism, fear of gays, believing you need a car to drive 4 blocks to get a loaf of bread.
My consensus is there is no way to live just one of those traits. You would either be like my dad who has his right wing beliefs and I can count on him like clockwork to do the same thing from the moment he gets up til he goes to bed. My beliefs are always open to change
Living by emotion alone will make you crazy. Feeling what you feel is fine. Having the wits to know your mad or upset will help you. It can be hard but leave a confrontation as soon as possible and keep your mouth shut. Cool down and rehearse what you want to say in a calm nonthreatening manner.
Reason is prolly the best one but I believe we need emotion, belief, and reason. Reason is why im typing this on a macbook. Reason is why people have evolved physically and technologically. Reason created super wheat and corn. Reason created nukes and missiles.
You can’t live on one of these. I would try reason though. Emotion will just get you in a fight. Belief will get you in an argument. Hah I changed my view of I preferred reasoning at the first and now im a belief guy. My beliefs are subject to change.