Hawzah News Agency - Imam al-Sadiq (a) says:

لا غِنى‏ أخصَبُ مِنَ العَقلِ، ولا فَقرَ أحَطُّ مِنَ الحُمقِ.

‘There is no wealth more productive than the intellect and no poverty lower than stupidity.’

al-Kafi, v. 1, p. 29, no. 34