Third time re-applicant, should I rewrite my primary essay?

I wrote a different essay for my 2nd application cycle, and I am really, really happy with what I wrote. I think it perfectly encompasses why I want to be a doctor and experiences to support that. It could use a few touch ups but looking back even a year later my thinking hasnt significantly changed. Would it be inappropriate to use the same (slightly altered) essay? Please advise! Thanks in advance.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums