Kitāb al-Ghayba > Philosophy and wisdom of Occultation
Hadith #15

فإن قيل: إلا منع الله الخلق من الوصول إليه وحال بينهم وبينه ليقوم بالأمر ويحصل ما هو لطف لنا كما نقول في النبي صلى الله عليه وآله وسلم إذ بعثه الله تعالى فإن الله تعالى يمنع منه ما لم يؤد فكان يجب أن يكون حكم الإمام مثله.

If it is said: Why does not Allah bar the people from reaching the Imam and why does not He protect him in a way so he may establish his rule and our grace is materialized for us? Just as we say about the Prophet when Allah sent him, He protected him until he had delivered the Shariah, it would be necessary that the Imam’s case be the same.