Every page of the Koran distinctly separates goodness from evil and the righteous from the wrongdoer. The Koran outlines all appropriate behavior, from general public conduct to personal hygiene. The most important thing is the purification of the soul and sincerity of the heart toward the faith. The Koran defines conduct toward friends, neighbors, strangers, and animals. It also warns about the luring path of Satan, describing its features and the scorching end to those who walk it.