Today, individuals and the world as a whole probably know too well the burden of interest, such that no one truly needs the above definition. Interest is something that is known to anyone living in a capitalist country. It has become so completely institutionalized and accepted in modern economies that it is almost impossible to conceive that there are some who completely oppose it and refuse any transactions that involve interest. But there are devout Muslims who refuse to deal in interest. The actual reason why such Muslims do not deal with interest is that interest has been forbidden by the Islamic religion, as shall be detailed in this book. At the same time, though, Muslims believe that God's guidance is based on His knowledge, wisdom and justice. In other words, God does not forbid something from humans for no reason whatsoever. Hence, there are definitely sound reasons-some of which we may be able to clearly recognize-why God has forbidden this practice.