This book is one of the earliest and most influential treatises on the relationship between western style law and Islam. The author regards codified law as the key to the regeneration and progress of Iran. One Word, or Yak Kelema was one of the first treatises to demonstrate that Islam is compatible with the introduction of modern western forms of government, and specifically that the sharia can be incorporated in a codified law comparable to that found in other European countries. The author argues the principles underlying constitutional government can be found in Islamic sources.