Hawzah News Agency - Imam Ali (AS) said:

العَقلُ حِفظُ التَّجارِبِ، وخَيرُ ما جَرَّبتَ ما وَعَظَكَ.

‘[To be a man of] intellect is to preserve your experiences, and the best of all that you have experienced is that which has taught you a lesson.’

Nahj al-Balagha, Letter 31