Imam Sadiq (a.s) said: “The speed of development of mutual feelings between two good people when they meet is similar to that of combining rain water with river water even if they do not verbally express their friendship. However, the distance between wicked people when they meet each other-even if they verbally express their friendship-is similar to the lack of feelings of the four-legged animals, even if they spend a lot of time eating grass together in a field.”