>>>Never look a gift horse in the mouth.
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>>Great! I didn't know, what this expression exists in English. In Russian we have the same proverb: "Darennomu konju v zuby ne smotrjat" :)
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>>Thanks.
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>Now do you understand the basis of the expression? That the age of a horse is best shown by the condition of the teeth...
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>Peter :-)

Yes, I knew that... Thanks for the further explanation...
It's interesting for me to find out the Russian/English proverbs analogues. Now, the question is: which culture invented this first :) Also I'd like to see some other examples...

Thanks in advance.