صُعوبَةُ الإخلاصِ The Difficulty of Sincerity

7ـ الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : تَصْفِيَةُ العَمَلِ أشَدُّ مِن العَمَلِ، وتَخْليصُ النِّيّةِ عنِ الفَسادِ أشَدُّ على العامِلِينَ مِن طُولِ الجِهادِ.

7– Imam Ali (AS) said, ‘Perfecting an action is more difficult than [performing] the action itself, and purifying an intention from corruption is tougher for the striving ones than engaging in lengthy jihad.’[Bihar al-Anwar, v. 77, p. 288, no. 1]
 

8ـ الإمامُ الصّادقُ (عَلَيهِ الّسَلامُ) : الإبْقاءُ على العَمَلِ حتّى يَخْلُصَ أشَدُّ مِن العَمَلِ .

8– Imam al-Sadiq (AS) said, ‘Persevering with an action until its end is harder than [performing] the action itself.’[al-Kafi, v. 2, p. 16, no. 4]