The emphasis in the holy Qur'an is not merely an instrument to decorate the speech and also is not a redundancy. The according to the circumstance, so that if it is omited the main part of the meaning will be lost.
The style of the emphasis in the whole is the main part of the meaning. The emphasis in the holy Qur'an is like a sign of painting which is drawn skilfuly, which demonstrates the greatness and the wonder. In the chapter of Yosof we find the emphasis.