It is called your inner voice. This decides what things you do and how you do it.
The literary concept you are referring to is called the "angel and devil on the shoulder" or more commonly known as a moral dilemma. It symbolizes the internal conflict between doing what is right (angel) and what is wrong (devil).
angel
angel was Gabriel, and Devil was satin
The concept of having an angel on one shoulder and a devil on the other symbolizes the internal struggle between good and evil or moral choices. This imagery represents the conflicting voices of conscience, with the angel advocating for virtuous behavior and the devil tempting one toward wrongdoing. This duality is often used in literature and popular culture to illustrate ethical dilemmas and personal decision-making.
loser you are
The archetypical fallen angel is called the "devil".
Traditionally the devil would be on the left shoulder, due to the belief that the left hand saide was the evil or sinister side. But really, you can get them on whichever side you want.
The song is called Devil in Disguise. "You look like an angel Walk like an angel Talk like an angel But I got wise You're the devil in disguise Oh yes you are The devil in disguise"
They are called "halfbreeds"
Angel on my shoulder.
Devil on My Shoulder was created on 2009-08-26.
To deceive you. Satan was never an angel. He's a jinn who became a devil.