Original: Some mosques have Arabic calligraphy and Qur'anic verses on the walls to assist worshippers in focusing on the beauty of Islam and its holiest book, the Qur'an, as well as for decoration.
Simplified: Some mosques have Arabic calligraphy and Qur'anic verses on the walls to help worshipers in focusing on the beauty of Islam and its holiest book, the Qur'an, as well as for decoration.