Rasoolullah’s (Sallallahu alaihi wasallam) frame of mind

What was Rasoolullah’s (Sallallahu alaihi wasallam) frame of mind? Hazrat Ibn Abi Haalah (Radhiyallahu anhu) answers: “Rasoolullah (Sallallahu alaihi wasallam) was perpetually worried (about the Aakhirat), constantly in thought (about matters pertaining to the Aakhirat) and he was ever restless.”  (Nashrut Teeb)