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

علَيكَ بِالتَّواضُعِ؛ فإنّهُ مِن أعظَمِ العِبادَةِ.

'You must be humble, as it is one of the greatest [forms of] worship.'

Source: Bihar al-Anwar, v. 75, p. 119, no. 5