Related:

• I don't think so.
• I think thinking is so important.
• I was so free with him as not to mince the matter.
  -- Miguel de Cervantes (1547-1616) -- Don Quixote, The Author's Preface...
• I think it a very happy accident. -- Miguel de Cervantes (1547-1616) -- Don Quixote, Part ii, Book iv, Chap.
  lviii...
• I don't think so - Homey the Clow
• I'm not so think as you drunk I am!
• I used to think I was indecisive, but now I'm not so sure.
• I used to think I was indecisive, but now I'm not so sure.