Q: Passage: The song was written by Houston, award-winning writer, Diane Warren and produced by David Foster, both of whom have written and produced for Houston before. The song was originally supposed to precede the album's UK release on August 31, 2009 and U.S. release on September 1, 2009 but was cancelled in favor of "I Look to You" and "Million Dollar Bill". However, the song was released on November 6, 2009 as a promotional single.

Question: Based on this passage, who wrote i didn't know my own strength lyrics? Let's give stream of consciousness first:
This is the relevant information: The song was written by Houston, award-winning writer, Diane Warren and produced by David Foster, both of whom have written and produced for Houston before. Therefore, the final answer is Houston , award - winning writer , Diane Warren.