Resigning from a job is never easy regardless of the circumstances. Whether you are resigning out of frustration or because of better career opportunities elsewhere, resignations represent an end to a chapter.
There will always be emotions involved and it may affect the way you write a resignation letter. If the resignation was necessitated by an incident or an untoward chain of events, it will be more difficult to keep emotions in check. It may be difficult but it is possible to write a resignation letter without harm feelings.
The process of writing a resignation letter without harm feelings starts even before you put pen to paper. The rule is this: