A cover letter is an important piece of your resume, it can determine if you get an interview or not. Prospective employees have been weeded out based on their cover letter, it is the first thing the employer reads.
It is important that your cover letter is written well. Please for the sake of your employer do not use the following words or phrases, literally, always, whom it may concern, even though, really, feel, and honesty.
These words do not make you sound accomplished or qualified for a potential job. Your cover letter should be an explanation of your skills and it all starts with how it is written.