hadith
10311
۞
Imam Ali (AS) said, Verily making intentions sincere and free from corruption is more difficult for the doers [of good deeds] than a prolonged, difficult struggle.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : إنَّ تَخْليصَ النِّيَّةِ مِنَ الفَسادِ أشَدُّ مِنَ العامِلينَ مِنْ طُولِ الاِجْتِهادِ