When resigning, I was thinking about adding something similar to the below:
I have accepted a position with another company that will further my growth and development in my career. I have enjoyed working at [company name] however, this new position will challenge my growth and further my career.
Wouldn't this sound rude to the current employer you are resigning from, as it makes it sound that the current employer does not offer a position which can further my career?
Thanks!