If I had been present at creation, I would have given some useful hints.

Related:

• Had I been present at the creation, I would have given some useful hints for the better ordering of the universe.
  Alfonso the Wise [Quoted in "VMS Internals and Data...
• Had I been present at the creation, I would have given some useful hints for the better ordering of the universe.
  Alphonso the Wise (1221...
• If the Lord God Almighty had consulted me before embarking upon the Creation,
  I would have recommended something simpler. -- Alfonso...
• My mother loved children -- she would have given anything if I had been one.
  Groucho...
• My mother loved children---she would have given anything if I had been one.
  Groucho Marx, 1890...
• If there had ever been a time when I could have given my own life to save her I would have done it.
  . --...
• If I hadn't had them,
  I would have had some made...