This attitude is one carried by the salaf. It was said that if you had placed a rock of gold in their palms, or a rock of mud, they would react in a similiar fashion. Meaning, they would not get extremely happy for the rock of gold, not increasingly sad for the rock of mud.

Ali bin Abi Talib is reported to have said, may Allah be pleased with him, “O son of Adam, do not be happy with richness and do not despair of poverty. Do not feel sad during affliction and do not rejoice over prosperity, for just as gold is tried by fire, the pious are tried by affliction. You will not attain what you want except by giving up what you desire, and you will not attain what you aspire to except by enduring patiently what you hate, and exerting yourself in implementing that which has been made compulsory upon you (by Allah).”