Tradition
St. Clement of Alexandria
Fragments
Chapter 30
Maximus and Antonius Melissa.
Souls that breathe free of all things, possess life, and though separated from the body, and found possessed of a longing for it, are borne immortal to the bosom of God: as in the winter season the vapours of the earth attracted by the sun's rays rise to him.
Source: Fragments (New Advent)