You don't even need to give a reason. You can simply write, "Please accept this letter as my resignation.Offer Advanced Notice; 4. We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company. "Constructive discharge" occurs when an employer makes working conditions so difficult, unpleasant, or outrageous that an employee is forced to quit. If you want to keep it professional you should avoid the detailed laundry list.