Time gives good advice.

Related:

• Always refuse the advice that passion gives. --
  English...
• If you wish good advice, consult an old man.
  Romanian...
• Good advice is something a man gives when he is too old to set a bad example.
  -- La...
• Good advice is something a man gives when he is too
  old to set a bad example...
• If someone gives you so-called good advice, do the opposite;
  you can be sure it will be the right thing nine out...