Let us think a bit further out into your career and say you have been working at your current job position a year. You have a yearning to apply to another unit in the same facility or you are moving

 Let us think a bit further out into your career and say you have been working at your current job position a year. You have a yearning to apply to another unit in the same facility or you are moving to another state, or you just want to try another nursing career field. How do you give up this current job eloquently, without hard feelings or "burning bridges"? Do you see the importance of writing a resignation letter and tell why you do or do not think it is important?