Can an emotional letter of motivation be harmful in a PhD application? Today some of my friends were discussing a motivation letter. One friend's application was rejected. One reason his friends find out is that the letter of motivation is very emotional. So I was thinking: is there no place of emotion in academia? People used to study a lot as a strong feeling works in them, inspiring them to do more and more work. This is the emotion. Can it play harmfully in a letter of motivation?

Edit: I have collected his small letter. It is included. We thought it is very emotional.


  College XY has best undergraduate mathematics department of the university of XY.
  IITX is built upon the basement of the first engineering college of Asia. I completed my B.Sc. from XY and M.Sc. from IITX. Both the times I got first class after each evaluation. I had a dream to continue my PhD studies in a good western university. I tried. My degrees are equivalent to degrees from European universities. I came to the understanding that my knowledge is not much sufficient for their requirements. Currently I am working in a project focussing on a very particular problem. I am out of touch from many interesting topics of mathematics. 
  Many advanced parts of mathematics are till unknown to me which shall be very useful in my work. So I am thing for a better opportunity to revise my 
  mathematical concepts in a better way and to collect new knowledge. I wish to build myself in a way that I can continue my PhD work in a good university and I can be a successful researcher. If I get the opportunity to continue the diploma hope I reach my dreams.
In brief, even after imagining that text's language cleaned up, the problem is not about "emotion" but about lack of verifiable substance. As in @aesmail's good answer, insubstantiated claims, or, worse, claims which appear to be counter to any documentable reality, are at best unpersuasive. For example, unsupported claims about the quality of one's university or department are at best pointless, and suggest that one does not know how things work. Proposing to "collect new knowledge" gives a very strange impression, as though the writer believed that learning new things was somehow unusual... while being remarkably inspecific. 

That is, if I were to receive such a letter, I'd consider it basically content-free, for all practical purposes. "Emotion" is not the issue. The problem is that such letters should not be content-free, but should include tangibles, past accomplishments and connections with the future, etc. A content-free letter competes very badly with content-ful letters.