Hawzah News Agency – Imam Mahdi (May God hasten his reappearance) says:

أمّا وَجـهُ الانْتِفاعِ بي في غَيبَتي فكالانْتِفاعِ بالشَّمسِ إذا غَيَّبها عَنِ الأبصارِ السَّحابُ.

Well the way of deriving benefit from me during my concealment is similar to benefiting from the SUN when it is hidden from the eyes by clouds.

Source: Biharl al-anwar, v.52, p.92