Sometimes life becomes like a desert without water and grass for you, everywhere you look there are no Effect of life, you realize that sometimes those who hurt you because of their worries, support you against dangers or your enemies. Like a strict friend. There, the meaning of life becomes clearer for you, true friendship. The following poem by the famous Iranian poet Saadi is about a true friend : دوست مشمار آنکه در نعمت زند لاف یاری و برادر خواندگی دوست آن دانم که گیرد دست دوست در پریشان حالی و درماندگی