Hawzah News Agency – Imam Sadiq peace be upon him says:

إنّ العَمَلَ الدّائمَ القَليلَ علَى اليَقينِ أفضَلُ عِندَ اللَّهِ مِن العَمَلِ الكَثيرِ على‏ غَيرِ يَقينٍ.

'Continuous but small actions [performed] with conviction are better in the sight of Allah than numerous actions without conviction.'

Source: al-Kafi, v. 2, p. 57, no. 3