Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

مَن أحْكَمَ التَّجارِبَ سَلِمَ مِن المَعاطِبِ، مَن غَنِيَ عَنِ التَّجارِبِ عَمِيَ عنِ العَواقِبِ.

'He who masters his experiences will be safe from harm, while he who feels needless of experiences will be blind to consequences [of actions].'

Source: Ghurar al-Hikam, no. 8040, 8680