I have been supplementing my career as a freelance copywriter with a part-time office assistant job. But now I feel that it's time to drop the training wheels and really commit 100% to my writing business. I'm getting more and more work, and shoehorning the part-time job into things is only making me tired and causing me to do less than my best work there. Time to move on. Please tell me if this resignation letter will suffice, or if I should change some things: I regret to inform you that I will be resigning my post at _________. My last day will be Friday, September 21, 2007. I am leaving to devote my full attention to my increasingly demanding writing career, and to allow you to replace me with an office assistant who can give you his or her full focus as _______ continues to grow. Thank you for the opportunity. I enjoyed working for you, and I wish everyone connected with ______ the very best. Sincerely, I welcome any feedback.