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

الخَيرُ كُلُّهُ صِيانَةُ الإنْسانِ نَفْسَهُ.

'Goodness in its entirety is man's guarding over himself.'

Source: Tuhaf al-Uqul, no. 278