Hawzah News Agency – Imam al-Sadiq peace be upon him says:

لا يَسْتَكمِلُ عبدٌ حقيقةَ الإيمانِ حتّى‏ تكونَ فيه خِصالٌ ثلاثٌ: الفِقهُ في الدِّينِ، وحُسْنُ التَّقديرِ في المَعيشةِ، والصَّبرُ علَى الرَّزايا.

'A servant cannot attain the reality of faith until there exist in him three attributes: learning the religion, good [i.e. economical] assessment of his living expenses, and patience in sufferings.'

Source: Bihar al-Anwar, v. 78, p. 239, no. 78