grep for a subject centos linux

Good morning folks. I am relatively new to unix and I am trying to search for a particular subject but I am getting everything but a subject against a mail log file. How do I search with grep to get only the contents of a subject like for example the subject is "sex tonight at 8". If I use grep and then use double quotes or single quotes I get nothing. If I use nothing then it returns everything. I am in the  /var/log directory please help.
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You need to escape the double quotes - Try grep '\"eat tonight at 8\"'
i will use grep -w "sex tonight at 8" that way will look only for the exact words no more no less

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