What can we learn from the Prophet Muhammad (peace be upon him) when Gabriel (peace be upon him) asked him what prevents him from visiting us more often than he visits us now?
 Narrated Ibn `Abbas:                     The Prophet said to Gabriel, "What prevents you from visiting us more often than you visit us now?" So there was revealed:-- 'And we (angels) descend not but by the command of your Lord. To Him belongs what is before us and what is behind us...'(19.64)