Imam Al-Ridha: True worship is not measured by how many prayers are performed and offered or how many days are fasted. In fact, true worship is to meditate deeply upon the affairs of God the Almighty and All-majestic.

الإمام الرضا: لَيْسَ‏ الْعِبَادَةُ كَثْرَةَ الصَّلَاةِ وَالصَّوْمِ إِنَّمَا الْعِبَادَةُ التَّفَكُّرُ فِي أَمْرِ اللَّهِ عَزَّ وَجَلَّ