Perfection isn't always to be when trying to say things just right in all you do. People tend to say the first thing that comes to mind, not the second, and not being judicious in what one says can have a rippling and collateral affect on others. This is true in family and in friendships. Keep in mind that when you attempt to give advice, the advice might not be wanted or warranted, and even if it is, unsolicited comments often don't go over very well.
So, let's say you DO stick your foot in your mouth, or someone has made comments for which they regret. Give people an opportunity to apologize and allow the person to be forgiven . . . and allow the even to be swallowed up and forgotten is part of the forgiveness process. No one should feel that in spite of 1,000 acts of kindness, service, and love to repair any damage or heartache that their efforts are in vain.
We all make mistakes, and being allowed to move on without the constant shadow and reminders of past deeds can greatly facilitate the healing process.