Hawzah News Agency - The Prophet (SAWA) said:

إنَّ العَقلَ عِقالٌ مِنَ الجَهلِ، والنَّفسَ مِثلُ أخبَثِ الدَّوابِّ، فإن لَم تُعقَلْ حارَت.

‘Verily the intellect is a lasso used to restrain ignorance, and the carnal soul is like the vilest of beasts which if left unrestrained will go wild.’

Tuhaf al-Uqul, no. 15