Ayatollah Khamenei
The lesson Imam Redha teaches us all is: Oh, Muslims! Do not get tired of struggle! Do not sleep, as the enemy is always awake; he is disguised in various forms and costumes, different masks and colorful paints; so, be sharp of eye! Recognize the enemy, and learn how to fight the enemy; like Imam Ali Ibn Musa Al-Redha (as) continued to struggle from beginning to the end! (Khamenei.ir)