could you translate it into English, please

Honi soit qui mal y pense (Old French for, "shame upon him who thinks
evil of it")
http://en.wikipedia.org/wiki/Order_of_the_Garter

Hi Marius,

'shame upon him who thinks evil of it' What might this message carry in meaning?
I have never heard it.

A liberal interpretation:
When you see this (particular) garter don't think of bad things, you scurrillous man, because this garter is a sign of valour--it is not a lady's thigh you should have in your mind right now. And shame on you

Really?

Well, don't make light of the name (of the Order of the Garter) by unwelcome associations, that's what it is in meaning.

And this is the official story:
http://www.randomhouse.com/wotd/index.pperl?date=19960827

Updated to current-day English, I would say,
"Shame on any of you (dirty-minded people) who take it the wrong way."
where "it" is the event recounted at the site Marius provided.
(The implication is that what happened was innocent.)

CJ