Secure delete on a Truecrypt volume

I encrypted my system drive with Truecrypt recently and out of old habit I used a file shredder to delete old files from it.
Then I came to think of it and wondered why bother secure deleting anything since its encrypted anyway. The next thought was, did that file shredder with its secure deletion routine somehow damage the encryption?

Might be a stupid question but would surely like to ask some of you pros out there. Thanks in advance!

 

Even if it's encrypted, user error may lead to unwanted consequences. The file is still available unless overwritten, so I wouldn't risk it.

No, it won't damage the encryption unless you try shredding TrueCrypt components. I just set it to zero out for efficiency, nothing overwritten with one pass was ever recovered anyways, you're more likely to win millions in the lottery.