Imam Ali (AS) said, The intelligent person acts when he knows and when he acts, he does so sincerely, and when he becomes sincere, he secludes himself [from others].
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : اَلعاقِلُ إذا عَلِمَ عَمِلَ وَ إذا عَمِلَ أخْلَصَ وَ إذا أخْلَصَ اِعْتَزَلَ