Imam As-Sadiq (a.s.) said:
اَلْمُؤْمِنُ حَسَنُ الْمَعُونَةِ خَفِيفُ الْمَؤُنَةِ، جَيِّدُ التَّدْبِيرِ لِمَعِيْشَتِهِ لا يَلْسَعُ مِنْ جُحْر مَرَّتَيْنِ
A believer provides valuable assistance, has low expenditure, and is prudent in life, and is never bitten twice from one hole (never inflicted twice from one source). 1
Belief has some scientific, moral and social manifestation and signs, without which it is only a meaningless name. The above tradition refers to four signs of it:
1- believers provide valuable assistance to their Muslim brothers because their help is accompanied with compassion, honesty and awareness.
2- they do not have a luxurious and costly standard of living and do not commit offenses to provide for it.
3- they are prudent and aware in life especially in economic affairs.
4- they take lesson from each event immediately and thus they are not inflicted twice from the same source.